Extraordinary Specialists

the best Diagnosis.

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The Collaborative Effort

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“I had my first visit in the office last week and the staff was AMAZING!!!! They made me feel so comfortable and at ease because the dentist is not my favorite place to be, but I had a great experience and would definitely recommend going to this office. It is also a great office to go to because they offer more services than a normal dentist office such as implants, veneers and so much more. I would highly recommend this office!!!”

Jarrett R.
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Giles Horrocks, DDS, MS

Board certified as a Diplomate of the American Board of Periodontology and internationally recognized as an author, key opinion leader, educator, and sought-after clinician in his field.

Dr. Horrocks completed his specialty training in Periodontology in the Department of Medicine and Surgery at the Veterans Administration Medical Center in Milwaukee, Wisconsin. As the founder of Boulder Periodontics, he has a passion for delivering a world-class patient experience with expert clinical care. He is a key opinion leader for Meisinger USA, Dentsply Implants, Mectron Piezosurgery©, Hu-Friedy, and Straumann©. As a writer, his work has been published in the International Journal of Periodontics and Restorative Dentistry, he authored a chapter in Piezosurgery® Assisted Controlled Ridge Expansion, and also a chapter in Minimally Invasive Dental and Implant Surgery (by Wiley Blackwell). As an educator, he serves as an Assistant Clinical Professor for the University of Colorado School of Dental Medicine and lectures around the world on Advanced Piezosurgery® and Controlled Assisted Ridge Expansion.

Raised in a traveling military family, Dr. Horrocks graduated high school in Germany and achieved the level of Eagle Scout. He successfully completed the Leadville 100 mountain bike race and also enjoys fly-fishing, skiing, golf, and raising his three teenage boys.

Christine Cole, DDS, MHS

Board certified as a Diplomate of the American Board of Periodontology as well as a published author, experienced clinician, and clinical investigator in her field. She is also respected as an expert in the field of Surgically Facilitated Orthodontic Therapy (SFOT).

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Dr. Cole is a graduate of the University of Colorado Health Science Center, School of Dentistry.  She completed her specialty training in Periodontics and earned a Masters of Health and Science at the Medical University of South Carolina where she was also Chief Resident. As a writer, she co-authored a chapter on “Periodontal Plastic Surgery” in a Wiley-Blackwell textbook on Minimally Invasive Implant Surgery. As a thought leader and lecturer, she speaks regularly for study clubs and pioneered a women’s interdisciplinary study group. Her expertise and experience in the field of Surgically Facilitated Orthodontic Therapy (SFOT) have made her one of the most sought-after SFOT practitioners.

An instrument-rated pilot herself, Dr. Cole is married to an airline pilot and they are the proud parents of two exceptional children. She enjoys yoga and paddleboarding (sometimes at the same time) as well as flying, biking, and nordic skiing.

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Ryan Lewis, DMD, MSD

An innovative prosthodontic pioneer pushing the limits of guided surgery by developing fully digital techniques and pathways utilizing intraoral scanning and 3D printing. A key opinion leader for Straumann, lecturing nationally on anterior implant esthetics, full arch implant therapy, contemporary implant planning, and guided surgery.

With a dentist as a father and an orthodontist as a grandfather, Dr. Lewis followed them into the family business by earning his Doctor of Medical Dentistry degree at the University of Louisville, School of Dentistry. He went on to complete a 3-year post-graduate training program for certification in Prosthodontics and a Master’s of Science in Dentistry at the University of Louisville. Known for precision results with dental reconstruction and cosmetic solutions, he is a widely sought after Prosthodontist by general practitioners and patients throughout Northern Colorado. He has received recognition from the International Congress of Oral Implantologists and his writing has been published in the Journal of Prosthetic Dentistry on digital guided implant surgery.

Dr. Lewis enjoys spending time with his wife, twin girls, and their animals (two dogs and a horse). He also loves to hunt, fish, hike, bike, and pilot.

Andrew Johann, DDS, MS, PC

Selected by his peers for 5280 – Denver’s Mile High Magazine, as the best Prosthodontist in his field for the last three years. He is a lecturer for Dentsply/Ankylos and a sought-after clinician and educator in his field.

Photo of Dr. Johann

Dr. Andrew Johann Graduated from Indiana University School of Dentistry, receiving the John F. Johnson Society Scholarship Award in Prosthodontics and being inducted into the Omicron Kappa Upsilon Honorary Dental Society.  Following dental school, he went on to complete a Master’s degree in Prosthodontics from The University of Minnesota.  He has served as past president of Boulder Dental Forum and as a lecturer for Dentsply/Ankylos, the Arizona Chapter of American College of Prosthodontics, the Boulder Implant Study Club, and other local dental groups. His presentations include topics like “Surgical and Prosthetic Teamwork to Achieve Stable Esthetic and Functional Implant Success”, “When to do an Implant Crown”, “How Long Should Dental Treatment Last,” and “Immediate Provisionalization of the Ankylos Implant.”

He takes full advantage of the beautiful Rocky Mountains as an avid fly fisherman/fly tyer and mountain biker.  He enjoys spending time with his lovely wife (Schwanda) and their three children (Breanne, Thomas, and Charlie).

Shannan Johnson of Rocky Mountain Dental Specialists

Shannan Johnson, DMD, MS

Board Certified as a Diplomate of the American Board of Periodontolgy, Chief of Periodontics/Advanced Education in General Dentistry faculty member at Luke Air Force Base and Offutt Air Force Base

Born and raised in Minnesota, Dr. Johnson traveled to Boston University for dental school where she met her husband, Derrik (a native Coloradan!).  Following graduation, she spent the next 13 years serving as a dentist in the Air Force. While on active duty, Dr. Johnson continued her dental training and skill development by completing both Advanced Education in General Dentistry (AEGD) and Periodontics residency programs. She also served as a periodontics faculty member for general dentistry residency programs at multiple Air Force bases.

While Dr. Johnson enjoyed serving military members and families in Virginia, Texas, Arizona, and Nebraska, she and her husband always planned to settle in Colorado.  They love spending time with their three beautiful children and building relationships in our community.  She also enjoys running, hiking, crafting, reading, cooking, skiing, traveling, and being with friends.

Kris Doll, DDS, MS


Dr. Kris Doll

Raised in Louisville, Kentucky, Dr. Kris Doll was taught early on that dedication and discipline are fundamental in the accomplishment of any goal. This knowledge prepared him in his journey as he worked full-time at a local hospital while fulfilling all requirements to graduate magna cum laude from The University of Louisville in 2005 with a bachelor’s degree in Biology. He went on to obtain his DMD (Doctorate of Dental Medicine) from the University of Louisville School of Dentistry in 2009.  Inspired by his grandfather’s accomplishments while in the United States Army during the Korean War, Dr. Doll went on to enlist in the United States Navy.  After completing Officer Developmental School in Newport, Rhode Island, he completed a 12-month AEGD program while stationed at Naval Station Great Lakes, Illinois. From there Dr. Doll volunteered to be one of only two dentists stationed at Naval Support Facility Diego Garcia located 7 degrees south of the equator in the Indian Ocean.  There he provided comprehensive dental care to DOD service members, the Royal Navy of the United Kingdom, and multi-national contractors.

Dr. Doll then traveled to Bethesda, Maryland where he completed a 3-year Prosthodontic residency program at the Naval Postgraduate Dental School.  After securing a reputation for his passion and excellence in the Clinical, Laboratory, and Academic Forums, Dr. Doll was asked to remain at the Naval Postgraduate Dental school for an additional 4 years.  During this time, in between an active clinical schedule and his role in the mentorship and development of postdoctoral residents, he led the development and oversight of the Navy’s first CAD/CAM laboratory which became the prototype for all future digital laboratories in the United States Navy.  In 2015, Dr. Doll became an assistant Professor for the Uniformed Service University of the Health Sciences and continued in this role until his honorable departure from the United States Military.

Upon leaving the capital region, Dr. Doll went on to one of the most rewarding stages of his career by providing prosthodontic care to the United States Marines while stationed in California from 2018-2022 at both Camp Pendleton and Marine Corp Air Station Miramar. Dr. Doll became a board-certified Prosthodontist in 2016 and is currently a Diplomat of the American Board of Prosthodontists and a fellow of the American College of Prosthodontists.

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