Meet The Team

Our Doctors


Dr. Robert F. Morrison

CEO and Clinical Director

Dr. Morrison is the owner and founder of Robert F. Morrison, DMD, PC, a General Williamsburg Dentist Practice for children and adults since 1992. 

Dr. Morrison founded the practice after returning from being stationed with the U.S. Navy in England with the goal of providing genuine and compassionate care for the families of Williamsburg and the greater Hampton-Roads area. 

The practice has grown to incorporate some of the latest dental technologies as well as continue to provide extensive and patient-oriented care for families and individuals. With a great team of Williamsburg dentists and staff, the offices of Morrison Dental Group pride themselves on the personal attention and skill that they can offer their patients. Dr. Morrison graduated from Southern Illinois University with a Bachelor of Science degree in Chemistry in 1979. He attended Southern Illinois University School of Dental Medicine, graduating in 1982, completing a post-doctoral residency in Comprehensive Dentistry. He served as a dental officer ashore and afloat from 1982-1991 in the U.S. Navy and was the dentistry department head afloat the U.S.S. Guam. Dr. Morrison was head of the Pediatric Department from 1987-1988, Dental Clinic, Norfolk Naval Station, Norfolk, Virginia.

Dr. Morrison is married to Alison, who serves as Morrison Dental Group’s CFO. They have two sons: Frank, a LCDR in the United States Coast Guard and Alex, who also works with Morrison Dental Group as the Chief Compliance Officer. In his spare time, Dr. Morrison is a dedicated family man and enjoys fishing on the Chesapeake Bay, as well as kayaking and restoring British MG cars.

Dr. Morrison is a member of the ADA, American Academy of Sleep Medicine, The VDA, the PDA, and the International College of Dentistry.


Dr. Katrina Thatch

Dr. Katrina Thatch has always had a passion for science and art, so when she first shadowed a dentist in high school, she became excited to find that dentistry seamlessly intertwines these two fields together. She spent many hours shadowing in offices and free clinics and witnessed the incredible impact that dentistry can have on the lives of patients. The bonds that dentists form with their patients is what drove her to pursue this field and attend dental school.

Dr. Thatch was born in Virginia, but has lived in Colorado, Minnesota, North Carolina, and Maryland. She is happy to come full-circle and return to Virginia. She attended The University of North Carolina at Chapel Hill for her undergraduate degree and then went on to attend the University of Maryland School of Dentistry, graduating magna cum laude. She completed a one-year residency in general dentistry at VCU School of Dentistry as well. Dr. Thatch is a member of the American Dental Association, the Virginia Dental Association, the Richmond Dental Society, and the Meridian Club. She has volunteered in numerous free clinics across Virginia, Maryland, and North Carolina, and continues to be involved in additional volunteer opportunities, such as Smiles for Heroes and Give Kids a Smile with MDG. Dr. Thatch enjoys being able to bring a new, beautiful smile to the faces of her patients. She loves educating, comforting, and instilling confidence in her patients as well. 


Dr. Thatch is married to Justin, a civil litigation attorney, and they have a sweet, inquisitive little boy named Henry and a large British shorthair cat named Karl. She enjoys reading, cooking, painting, and watching college basketball. She and her husband both love exploring Virginia on weekends or visiting the beach. Dr. Thatch describes herself as compassionate, energetic, a good listener, a lifelong learner, motivated, and dedicated. She is a member of a book club and is also involved in her local church. Dr. Thatch loves to travel and studied in Florence, Italy during her time in college. A fun fact about her is that she has played several interesting musical instruments throughout her life including the oboe, flute, piano, and xylophone.


Dr. David Kelly

Dr. David Kelly was born and raised in Bristol, VA.

Being the son of a dentist, he grew up in the office watching his father work. When he was old enough, he would answer phones, work in sterilization, and began developing a desire to provide the same care his father was providing. This led Dr. Kelly to attend Emory and Henry College for his undergraduate degree and then head to dental school at VCU’s School of Dentistry. He continued working with his father at his office before developing a practice of his own. Dr. Kelly has practiced in various cities around Virginia and has volunteered with Healing Hands and Cross Roads Medical ministries providing free dental services to the needy. He is also Invisalign and Six Month Smiles certified. He is very experienced with dental implants as well.

Dr. Kelly believes the best part of being a dentist is seeing a person’s life change for the better by simply improving their smile. Getting someone out of pain and on the road to recovery is also very rewarding, but helping a patient get on board with their own daily hygiene through compassionate care is a goal of his.

Dr. Kelly has two adult sons and in his spare time, he enjoys live music and sporting events. Some of his most recent ticket stubs were to Dave Matthews Band, Chicago, Doobie Brothers, Earth, Wind, and Fire, as well as UVA vs. Tech Football games, the Orange Bowl, and Masters Golf Tournaments. If time permitted, Dr. Kelly would play more golf. He is also a huge fan of Star Wars.

Dr. Rafael Siqueira

Dr. Rafael Siqueira

Dr. Rafael Siqueira is originally from Recife, a beautiful town on the coast of Brazil. He attended the University of Pernambuco in Brazil and graduated from dental school in 2010.

He then went on to complete a Masters of Implantology which is similar to a US residency program. After completing that, he joined a PhD program at the Federal University of Pernambuco which sent him to the University of Michigan to do research for his master’s thesis. Once he completed his PhD, he headed back to Michigan School of Dentistry for a 3-year residency in Periodontics. During his time in school and residency, he was able to publish over 30 scientific articles in international peer reviewed journals and write five book chapters. This resulted in a few awards over the years.

Dr. Siqueira’s interest in dentistry started to develop very early in his life by watching his parents who are both dentists. He observed his father teaching students and treating both students and patients with compassionate care. He witnessed a few instances where patients were moved to tears by the results of his father’s care and students whose lives were so strongly impacted by the mentorship his father provided on their path to become a Periodontist or Implantologist. Dr. Siqueira soon realized he wanted to have that same positive impact by being a dentist, educator and researcher.

Dr. Siqueira describes himself as not only family-oriented and very sociable, but also easy-going and calm. He loves being with friends, having a good time and sharing great food. He is typically very optimistic. He is married to Renata, a lawyer, who just recently gave birth to their first child, Thomas. They do not currently have any pets but hope to add a dog to their family in the near future. Dr. Siqueira is a big sports fan, food lover and loves to travel. His hobbies include playing tennis, watching sports, exploring new restaurants, travelling and meeting new people, and learning new languages. A fun fact about Dr. Siqueira is that he speaks his native language, Portuguese, as well as English, Italian, and can communicate quite well in Spanish. He is currently taking a Spanish course to improve his fluency.

Our Staff


Alex Morrison

Regional Manager

Alex Morrison is from Williamsburg, VA. He helps with overseeing the Midlothian, Mechanicsville and Chincoteague offices, monitoring supplies and compliance for all offices as well.

He and his wife have a young son and two chocolate labs. When he isn’t working, he likes being outside and fishing.

Amanda Hewitt (1)

Amanda Hewitt

Area Manager

Amanda Hewitt joined the MDG family in July of 2018. She was born in Cape May, NJ and was raised in New Gretna, NJ.

After going to school for Forensic Science, her life took a different course and brought her here to Virginia and to our office. Amanda most enjoys working with our patients.

She gets satisfaction from seeing someone walk in the door upset and hopeless because they’re in pain or just don’t like their smile, and they leave happy, healthy, and smiling! In her spare time, Amanda enjoys hunting, fishing, crabbing, and spending time with her kids. She has a cat, dog, and a very old goldfish. A fun fact about Amanda is that she is a sharpshooter.


Michelle Wiley

Office Coordinator

Michelle Wiley was born and raised in central Florida. She started in dentistry by becoming a dental assistant in high school. She eventually moved into an administrative role and then on to office management.

Michelle’s biggest passion is helping people. She loves to see patients leave our office without pain and educated about their dental health. She also enjoys seeing physical transformations that many of our patients go through to bring their smile back. Michelle describes herself as “not a homebody” and loves to work because it is so rewarding to build relationships with patients and co-workers. 

Michelle is married and has a 20 year old daughter. In her spare time, Michelle enjoys spending time with her husband, daughter, their dog, and two cats, Lil Man and Bit Bit. They love going on drives and exploring new places they have yet to discover!