About Us – Colorado Bariatric Surgery

Colorado Bariatric Surgery is a comprehensive bariatric surgery practice, offering patients compassionate support throughout their weight-loss journeys. The group is headed by Richard Tillquist, M.D., a board-certified surgeon with more than 18 years of experience in weight-loss surgery treatments.

Colorado Bariatric Surgery specializes in Roux-en-Y gastric bypass, adjustable gastric band (Lap® Band and Realize® Band) and sleeve gastrectomy procedures for your weight-loss needs.


Colorado Bariatric Surgery is affiliated with Swedish Medical Center, a Level I Trauma Center and is a member of SurgOne, a comprehensive general surgery group committed to providing the best surgical care in an integrated medical environment to patients throughout Colorado and the Rocky Mountain region.

The Bariatric Surgery Center at Swedish Medical Center is a designated Bariatric Surgery Center of Excellence. Swedish Medical Center and Colorado Bariatric Surgery were awarded this distinction by the American Society of Bariatric and Metabolic Surgeons (ASBMS), the largest society for bariatric surgery in the world.

South Denver Metro Location

Colorado Bariatric Surgery’s office is located on the Swedish Medical Center campus, which means our patients will visit the same, convenient Englewood, Colorado location for pre-surgery appointments, surgery, support and follow-up appointments.

Meet the Team

Dr. Richard Tillquist, M.D. Eileen Thurston, Patient Coordinator
Screen Shot 2013-04-09 at 8.52.21 AM Eileen Thurston, Patient Coordinator
Dr. Tillquist is a board-certified general surgeon specializing in bariatric surgery. He earned his undergraduate degree in biology from the University of Colorado at Boulder and performed cancer research at both the University of Colorado Medical Center and the Baylor College of Medicine. Dr. Tillquist then earned his medical degree from the Baylor College of Medicine in Houston, Texas and completed a general surgery internship and residency at the Baylor University Medical Center in Dallas, Texas.

Dr. Tillquist has more than 18 years of experience in bariatric surgery, performing laparoscopic Roux-en-Y Gastric Bypass, laparoscopic adjustable gastric banding and laparoscopic sleeve gastrectomy. He also has continued interest in all areas of general surgery, including hernia, gallbladder, colon, thyroid, parathyroid, hiatal hernia, and other advanced laparoscopic surgeries.

Dr. Tillquist is married and has two children. A Colorado native, he enjoys hiking, fishing, golf, and woodworking.
Eileen Thurston has been with SurgOne, P.C. for over 14 years.

She has been the Bariatric Patient Coordinator for Colorado Bariatric Surgery since 2002.

Her responsibilities include: all secretarial needs for the office, organizing pre-operative testing exams, obtaining surgery pre-approvals, and scheduling all aspects of the surgery and follow-up appointments.

In her free time, she enjoys riding her motorcycle and spending time with her grandchildren and her horses.