Our Doctors

Dr. Mark Kaschube
Dr. Mark Kaschube

The Magic Dentist
Dr. Mark Kaschube is an experienced general dentist, the founder of Grand Dental Group, and believe it or not, a professional magician. Performing has been a part of his life for as long as he can remember. Born and raised in the Midwest, he embraced his local roots, attending Holy Ghost grammar school and Marist High School. When it came time for higher education, Loyola University in Chicago and Loyola Dental School were his choices.

“Excellence is never an accident; it’s the result of high intention, sincere effort, intelligent direction, skillful execution, and vision.” Dr. Mark continues to gain knowledge by exceeding the annual requirement for continuing education and staying active in professional organizations, such as the American Dental Association, Academy of General Dentistry, American Academy of Cosmetic Dentistry, Illinois State Dental Society, and CEREC Study Club.

Service is a Way of Life…
A natural extrovert and performer, Mark found his niche in life at an early age. He was active in school, church, community, and scouting activities where he earned the honor of Eagle Scout. To this day, he’s still extremely active in community service projects. He regularly puts on magic shows at preschools, participates in parades, and he’s the driving force behind the annual Halloween Magic Show, seen by thousands.

Keeping Magic Alive…
Dr. Kaschube’s love of magic isn’t limited to his patients and local community. For ten years, he helped promote National Children’s Health Month by appearing with Bozo the Clown on WGN-TV’s syndicated television show “Bozo’s Circus.” He’s also performed in Las Vegas and Europe, and is a member of The International Brotherhood of Magicians. Dr. Mark is always looking for a way to put a little “magic” in your smile!

Dr. Napier
Dr. Steve Napier

Dr. Steve Napier has two passions, music and dentistry. His music career began with guitar lessons at an early age and led to a high school band. When he realized he wasn’t going to be a rock star, he turned his attention to dentistry and became a co-partner at Grand Dental Group. An avid music buff who continues to play guitar with multiple acts, he continues to satisfy his need to appear before an audience by speaking and performing in the surrounding communities.

A graduate of the University of Illinois, Dr. Napier attends continuing education courses in excess of the annual required amount. He feels one of the best ways he can serve his patients is to stay current with all of the latest technology, techniques, and materials. He maintains active memberships with the American Dental Society, the Academy of General Dentistry, the American Academy of Cosmetic Dentistry, the Illinois Dental Society, and the CEREC Study Club. Dr. Steve likes being part of a progressive group practice that offers general and specialty care to patients of all ages, in state-of-the-art facilities.

Service is not just a vocation; it’s a way of life. Dr. Napier is active in community, church, school, and sporting events. For seven years, Dr. Steve coached and served on the board for the Leyden Bears football program, and recently he started coaching soccer, lacrosse, girls’ softball, and girls’ basketball. He approaches everything he does with enthusiasm, which exemplifies his personal philosophy: “It can be done!”

Dr. Crown
Dr. Ward Crown

Dr. J. Ward Crown practices and lives in Sycamore, Illinois. He came to work at Grand Dental – Sycamore in 2004 and he and his family are active in the local community. He graduated from the Southern Illinois School of Dentistry where he received his Doctorate of Dental Medicine (DMD). Dr. Crown has been working in dentistry since 1994 and enjoys all aspects of his field. He continues to take continuing education classes to become aware of the latest dental techniques and dental materials that provide the best possible service to his patients.

Dr. B. Bruce Abdullah

Periodontics & Implants
Dr. Bruce Abdullah earned his dental degree from Loyola University School of Dentistry. He received his Certificate in Periodontics and Masters Degree in Science from Tufts University School of Dental Medicine in 1989.

He is currently an Associate Clinical Professor of Periodontics in Post Graduate Periodontics at the University of Illinois and has been teaching for the last 16 years. Dr. Abdullah both performs and teaches the latest techniques in implant and periodontal surgery. Furthermore, he is responsible for instructing students and residents on the placement of implants and advancements in the field of implant surgery. Dr. Abdullah is fortunate to have lectured both nationally and internationally on a broad range of topics, including periodontal plastic surgery and enhancing aesthetic outcomes in cosmetic restorative dentistry.

In 1987, Dr. Abdullah became one of the very first periodontists to be trained in the field of implant osseointergration by the esteemed Professor Per-Ingvar Branemark. Currently, he is among only a small percentage of periodontists throughout the world that has attained the qualifications necessary to become a Diplomate of The American Academy of Periodontology.

Dr. Abdullah was named by his peers to the list of “The Best Dentists in the United States”. He is one of 7,119 Dentists chosen from the 150,000 actively practicing Dentists in the United States to be listed on www.bestofus.com.

Additionally, the Consumers’ Research Council of America announced the inclusion of Dr. Abdullah to the publication “Guide to America’s Top Dentists”. The selection process is based on a point value system that awards points for education, years in practice, affiliations with professional associations and board certifications.

Dr. Abdullah has also been included in “Strathmore’s Who’s Who“. Based on one’s position and lifetime of accomplishments, Strathmore honors professional men and women in all academic areas and professions. Inclusion is limited to individuals who have demonstrated leadership and achievement in their occupation, industry, or profession.

Dr. Nikas
Dr. Jeffrey A. Nickas

Dr. Nickas received his bachelors degree from the University of Illinois at Urbana-Champaign, and completed his dental schooling at the University of Illinois at Chicago, where he received the Dr. Lina K. Tharp award for compassion in providing care to his patients. He continues his education to this day, regularly attending courses at the Cosmedent Center for Esthetic Excellence. He has also received further training in endodontics, periodontics, and with the Dawson Academy for Dental Continuing Education. Dr. Nickas has also taken courses in the area of dental implantology, receiving training in both the placement and restoration of dental implants. He is certified both in Lumineers and Invisalign, and recognizes that a true doctor never stops being a student.

Dr. Nickas’ practice philosophy centers on patient comfort and education. “Coming from a dental-phobic family, I realize that many patients have had difficult experiences in the past. I strive to create a relaxing atmosphere, and will listen to your concerns.” He believes in a patient-centered method, and will take the time to explore your treatment options with you.

“I feel that my staff is an extension of me. If I could do it all, I would, but it takes a team to properly treat our patients. I would not be able to do my best work without the extraordinary effort of my assistants and staff.”

“One of the reasons I chose to pursue dentistry is that it allows me to create lasting relationships with my patients. I am a wholehearted Chicagoan, live music aficionado, and sports fan who always enjoys meeting patients with unique tastes. Oftentimes, I end up learning as much from you as you from me.”

Dr. Nierzwicki
Dr. Joe Nierzwicki

Dr. Joe Nierzwicki, a native of Chicago’s northwest side, attended Fenwick High School in Oak Park, IL where he excelled both in and out of the classroom. Graduating with a 4.0 GPA as a three-sport student-athlete, Dr. Joe decided to accept a soccer scholarship to Loyola University Chicago where he continued to pursue his passion for academics and athletics. Graduating Magna Cum Laude with Biology Honors, Dr. Joe moved out to Omaha, Nebraska, where he earned his DDS from Creighton University School of Dentistry.

As a dentist, Dr. Joe enjoys all aspects of general dentistry and loves getting to know more about his patients. Dr. Joe is also a member of Omicron Kappa Upsilon, a national dental honor society, the American Dental Association, Illinois State Dental Society, and Chicago Dental Society. Having finished two Chicago marathons, Dr. Joe is an avid runner. In his free time, he enjoys hanging out with his family and cheering on his two favorite Chicago sports teams, the Bears and the White Sox.

Dr. Yanez
Dr. Taina Yanez

Enjoying the outdoors, spending time with her pets, sharing laughs with her family, and providing excellent dental care are just a few of Dr. Taina Yanez’s passions. Dr. Yanez was a Grand Dental Group patient long before she earned both her undergraduate degree (with honors) in biological sciences and her doctorate degree in dentistry from the University of Illinois at Chicago. She is an active member of the American, Illinois State, and Chicago Dental Societies.

Dr. Yanez grew up in the Chicagoland area and is a second-generation Grand Dental Group team member. Her mother was one of the first dental assistants to work with both Dr. Mark Kaschube and Dr. Steve Napier. In fact, the sealants that Dr. Napier placed on Dr. Taina’s teeth as a child are still present! Although she is a self-proclaimed chocoholic, Dr. Taina is cavity-free to this day as a result of excellent Grand Dental care!

Dr. Yanez is genuinely enthusiastic about providing quality patient care and dedicates much of her personal time and energy to local community events. With a fluency in Spanish, Dr. Taina is able to provide education and dental treatment to all patients with comfort and compassion. She is excited to meet you, your family, and your friends. Dr. Yanez’s professional goal is to create a long-lasting relationship with her patients and their teeth!

Dr. Hare
Dr. William Hare

Dr. William Hare is a native of the southwest suburbs and a graduate of Lockport Township High School. He then attended the University of Illinois at Chicago, where he earned his Bachelors of Science and then completed his dental education at the University Of Illinois College Of Dentistry. Dr. Hare is proficient in all areas of general dentistry, including oral surgery, endodontics, and removable and fixed dental prosthodontics.  

Dr. Hare is committed to providing the highest level of dental care for his patients and to make each and every patient as comfortable as possible. With a philosophy centered on patient desires and treatment goals, Dr. Hare will formulate a treatment plan that is best for you.

Dr. Hare is a member of the American Dental Association, the Illinois State Dental Society, and the Chicago Dental Society.  In his free time he enjoys watching sports, swimming, and spending time with his friends and family.

Dr. Gonzalez
Dr. Ricardo Gonzalez

Pediatric Dentist
Dr. Gonzalez received his dental degree from the University of San Carlos in Guatemala where he was recipient of the “Top Student in Pediatric Dentistry” award and was honored with a “Rotary Foundation Educational Award” for outstanding student in Central America.

He attended University of Illinois at the Medical Center in Chicago where he obtained a Certificate of Pediatric Dentistry and a Master of Science academic degree.

Previous academic appointments include Assistant Professor at the University of Illinois Pediatric Dentistry Department, where he dedicated his time to the area of Growth & Development and Preventive and Interceptive Orthodontics for the child patient. He also served as Clinic Director of the Undergraduate Pediatric Dentistry Clinic.

Dr. Gonzalez recently retired from Midwestern University where he had an appointment of Assistant Professor, served as Clinic Supervisor and Supervisor of the Specialty Suites.

In addition to his extensive years in higher education and being certified by the American Board of Pediatric Dentistry, Dr. Gonzalez has been in active practice for over 30 years. He regularly attends conferences and seminars that focus on the latest developments in pediatric dentistry and orthodontics, providing enormous benefits to his young patients.

Dr. Gonzalez understands the family dynamics of his patients and their loved ones. He aims to serve your family with the highest level of service with the quality of care you deserve. Dr. Gonzalez’ philosophy is to establish early, attainable, and reasonable goals with parents and their child which will promote oral health throughout childhood and beyond. In addition to enjoying his patients and practice, Dr. Gonzalez appreciates history and travel.

Dr. Bice
Dr. Brandon Bice

Dr. Brandon Bice was born and raised locally, growing up in the small community of McCook, IL. Attending Lyons Township High School, Brandon was a standout two sport athlete, achieving All-State honors in Football and multiple Division I scholarships. After choosing to pursue football at Northern Illinois University, Brandon went on to become a three-year starter at Defensive-End and Captain for the Huskies. During his tenure the Huskies made three Bowl Game appearances while Brandon earned all-conference honors. Dr. Brandon became passionate about service early on as he pursued his undergrad degree in Biological Sciences and Chemistry. Brandon participated in service at the DeKalb Opportunity House, Hope Haven, and the Big Brothers Big Sisters club throughout his time at Northern Illinois University.

Dr. Brandon went on to receive his Doctor of Dental Medicine (DMD) degree from Midwestern University College of Dental Medicine in Downers Grove, IL. He trained there using state-of-the-art technology, while following the most current research and practices. While working toward his degree Brandon founded the Academy for Sports Dentistry Club at CDMI. During his time at Midwestern, he developed high standards of care, where patients’ needs come first. Upon closure of his degree, Brandon was inducted into the school’s chapter of Omicron Kappa Upsilon, the National Dental Honor Society.

Dr. Brandon is proficient in all aspects of general dentistry and is excited to come on board and join a team of outstanding clinicians. He is currently a member of the ADA, CDS, ISDS, ASDA, AGD, ADEA, and Students Professionalism and Ethics Association. Dr. Brandon is a huge Chicago Sports fan, enjoys traveling, and living an active lifestyle when outside of work.

Dr. Montoya
Dr. Marcos Montoya

Dr. Montoya is a proud new addition to the Grand Dental Family. He and his wife have recently moved back to the North-West suburbs and are enjoying the area. Dr. Montoya was raised in Glenview, and attended Loyola Academy High School. As a high school student, he was an All-State ice hockey goalie and won two Illinois State Hockey titles. His passion for medicine and science ultimately motivated him to graduate from the University of Illinois at Urbana-Champaign with a biology degree. He then went on to graduate from the University of Illinois at Chicago College of Dentistry with his Doctorate of Dental Surgery (DDS) in 2012. During his later years at the college, Dr. Montoya was honored with a student teacher position, where he served with great value to help implement UIC’s new dental curriculum. He is an avid student of life, but he also enjoys sharing his knowledge with others especially his patients.

Dr. Montoya has been practicing in Chicago since 2012 with his aunt who is also a dentist. “My aunt has been such an invaluable mentor and source of knowledge throughout my career.” Dr. Montoya is a dynamic dentist, always up-to-date with the latest dental research and technology that help improve the lives of our patients. “I really enjoy building rapport with each patient individually. Every person is unique in their own way and must be cared for properly.” Dr. Montoya is a member of the Chicago Dental Society and the American Dental Association.

Dr. Montoya’s true joy is traveling with his wife and exploring new places. Just this past year, they spent a week traveling through Bogotá and Cartagena, Colombia. He also enjoys doing CrossFit at his brother’s gym and loves watching his older brother play in the National Hockey League for the Florida Panthers.

Dr. Sexson
Dr. Gary Sexson II

Dr. Sexson was the original orthodontist that helped develop the orthodontic program for Grand Dental back in 1998. He later left to create his own successful network of orthodontic offices in the Chicagoland area and Rockford, Illinois which he still maintains. Dr. Sexson was brought back as a consultant for Grand Dental to help revamp their orthodontic program. During his consultation period it was determined that there was a lot of untapped potential for this program, therefore, his company decided to buy into the orthodontic program and combine forces with Grand Dental to form Aim Orthodontics.

Dr. Sexson grew up in both Northern Illinois and Southern Wisconsin. He received his dental degree from Southern Illinois University School of Dental Medicine. He then completed his residency in orthodontics and masters program at Marquette School of Dentistry.

Dr. Sexson is a member of the American Association of Orthodontists, Illinois State Dental Society, Chicago Dental Society, and several local dental societies. He is also actively involved in the community’s Children’s Dental Health program featuring the Give Kids a Smile campaign and the Illinois Society of Orthodontists Donated Orthodontic Services.

Dr. Sexson, along with his associates and staff, attend numerous workshops and seminars to keep abreast of the constantly changing aspects of orthodontic care and treatment.

Dr. Sexson is happily married with two awesome children, Gabriela and Gary III. In his spare time, he likes to play golf, play the guitar and spend time with his family.


  • Graduate Southern Illinois University School of Dental Medicine, D.M.D.
  • Graduate Marquette School of Dentistry, M.S.
  • Invisalign certified orthodontist
  • Certified in Orthodontics and Master’s of Science in Orthodontics
  • SureSmile certified orthodontist


  • AAO-American Association Orthodontics
  • ABO-American Board Orthodontics
  • ISDS-Illinois State Dental Society
  • ADA-American Dental Association
Dr. Guloy
Dr. Robertzon Guloy

Dr. Robertzon Guloy received his Associate degree in Health Science Education and Doctor of Dental Medicine degree from the University of the East (Philippines) in 2003. He performed his fellowship training in Temporomandibular Joint Disorder and Orofacial pain at the University Of Rochester Eastman Dental Center. He was a resident of Advanced Education in General Dentistry at the University Of Connecticut Health Center, and completed his orthodontic residency at Jacksonville University School of Orthodontics.

Dr. Guloy is Board Certified by the American Board of Orthodontics and a Diplomat of the American Board of Orthodontics. He is also an active member of the College of Diplomats of the ABO, the American Dental Association, Midwestern Society of Orthodontists, the American Association of Orthodontics, and the American Board of Orthodontics.

Dr. Guloy currently resides in Chicago. When not practicing orthodontics, he plays acoustic guitar and the ukulele, has an interest in digital photography and painting, and enjoys basketball, swimming and tennis. He is an avid Chicago sports fan, enjoys fitness and promoting healthy life styles.

Dr. Guloy welcomes new patients and looks forward to meeting you and your family. He and his amazing team are ready to give you the smile that you have always wanted.

Dr. Hass
Dr. Caitlynn Haas

Dr. Caitlynn Haas proudly graduated from Michigan State University before pursuing her doctorate of dental surgery (DDS) degree from University of Michigan School of Dentistry. After postgraduate training at Loyola University Medical Center, Dr. Haas joined the team at Grand Dental Group, primarily practicing out of the Franklin Park office.

As a dentist, Dr. Haas loves that each patient has a unique objective, whether that be having a bright smile, being pain free, or just being able to chew comfortably. She truly enjoys meeting new patients and working with them to achieve these goals. She is a member of the American Academy of Cosmetic Dentistry, the Academy of General Dentistry, the American Dental Association, Illinois State Dental Society, and the Chicago Dental Society.

Outside of the office, Dr. Haas can be found in the great outdoors, running or rollerblading by Lake Michigan or traveling to new and exciting places. She’s also a huge Michigan state fan and loves to cheer on Spartan football and basketball.

Dr. Paige Wells
Dr. Paige Wells

Dr. Paige Wells completed her undergraduate studies at DePaul University in Chicago and graduated Cum Laude in Biology. She then graduated from the dental program at Midwestern University in Downers Grove before joining the Grand Dental team. Practicing primarily at the Channahon office, Dr. Paige believes that her greatest responsibility as a dentist is educating her patients and ensuring that they understand their oral health. She loves that the Grand Dental Group places a high value on patient education, as well as patient comfort, and that as a team they make every effort possible to allow patients to ENJOY visiting the dentist.

Dr. Paige is a member of the American Dental Association, the Illinois State Dental Society, and the Chicago Dental Society. She happens to be married to another member of the Grand Dental team, Dr. Cole Wells. They enjoy traveling and spending weekends during the summer months at Lake Wisconsin boating, fishing, and sitting by the campfire with their puppy, Hannah.

Dr. Cole Wells
Dr. Thomas Cole Wells

Dr. Cole Wells is an associate dentist who bounces between the Grand Dental – Franklin Park and Grand Dental – Aurora, providing excellent care to his patients and lightening the atmosphere with his keen sense of humor. Dr. Cole received his bachelor’s degree in biology and biochemistry from Augustana College before graduating from the dental program at Midwestern University.

He’s a problem solver, and loves having the ability to take patients out of pain to allow them to achieve a health that they are confident in, as well as esthetics that they can be proud of. He is a member of the American Dental Association, the Illinois State Dental Society, the Chicago Dental Society, and the American Academy of Implant Dentistry, where he is pursuing continuing education on endodontics and implant dentistry.

Dr. Cole grew up in Bloomington and often played golf with his dad at Augustana. He is married to another member of the Grand Dental team, Dr. Paige Wells. Together, they enjoy spending time with family, including their white lab Hannah, as well as cheering on their favorite Chicago sports teams. Dr. Cole is also an avid reader who enjoys historical novels and biographies.