BIOTE PROVIDER

Former U.S. Navy Medical Corps Lieutenant Commander John Tillett, MD FACS, practiced urology in the military and also private practice in Florida before joining TUCC in 2016. He is currently an assistant professor at the University of Colorado School of Medicine. He is also is the director of the Urology training program for the Swedish Medical Center General Surgery residency program. He is also actively involved as a sub-investigator in multiple clinical trials in the TUCC Research Department.

Dr. Tillett graduated magna cum laude from Vanderbilt University and received his medical doctorate from Emory University School of Medicine, where he earned the Joseph B. Whitehead Surgery Scholarship. He completed his residency and served as Chief Resident at Emory, where he was recognized with the Department of Urology Award for Outstanding Academic Achievement and the prestigious Resident Achievement Award by the Society of Laparoendoscopic Surgeons. In 2010, Dr. Tillett was recognized by the Deputy Surgeon General of the U.S.Navy as being among the top five urology providers in the Navy ranked for satisfaction by outpatient clinic patients. He is certified by the American Board of Urology and is a fellow of the American College of Surgeons.

Dr. Tillett’s clinical areas of expertise include the management of chronic scrotal/testicular pain disorders, urinary stone disease, microsurgery, men’s health, bladder cancer, and urologic disorders in patients with spinal cord injury and other neurologic diseases. He has performed more microsurgical denervation of the spermatic cord operations for the treatment of chronic testicular pain than anyone in the region, and he was one of the first urologists in the country to specialize in the use of Jelmyto, an innovative, kidney-preserving treatment for urothelial cancers of the upper urinary tract.

In his free time, he enjoys spending time with his family, travel, tennis, and college football.

Garrick M. Greear, M.D., is a fellowship-trained surgeon, researcher, educator, and patient advocate who specializes in men’s health, infertility, and prosthetic urology. His clinical interests include advanced erectile dysfunction, peyronie’s disease, male factor infertility, and male stress urinary incontinence.

“I am committed to providing a compassionate, comprehensive, and evidence-based approach to the treatment of male infertility and sexual dysfunction. I believe in fully understanding my patient’s goals before crafting a treatment path to meet their needs.”

Dr. Greear has extensive experience with complex microsurgery for male factor infertility, genitourinary reconstruction, and prosthetic urology (penile implant and incontinence procedures). He has presented research in these fields at multiple international meetings and is an active member of the Sexual Medicine Society of North America, Society for the Study of Male Reproduction, and the American Urological Association.

Dr. Greear completed his undergraduate training at the University of Washington, where he graduated cum laude and was inducted into Phi Beta Kappa. He received his medical degree from Boston University, where he graduated cum laude and was inducted into the Alpha Omega Alpha medical honor society. He completed his general and urologic surgical training at the University of California, San Diego. He then returned to the University of Washington to complete a fellowship in Andrology and Men’s Health.

In his personal time, he enjoys playing tennis, hiking, camping, skiing, and spending time with his wife and children.

Caitlin earned a Bachelor of Science degree in Health and Exercise Science, with an emphasis in Sports Medicine from Colorado State University. She completed her Master Physician Assistant Studies degree at Grand Valley State University in Grand Rapid, MI. Prior to joining TUCC, Caitlin worked in Urology here in Denver, as well as Primary Care.

Caitlin is a certified physician assistant through the Colorado Board of Medical Examiners and the National Commission on Certification of Physician Assistants. She is a fellow member of the American Academy of Physician Assistants and a member of the American Urological Association.

Prior to joining TUCC, Richard Heppe, M.D., practiced with Colorado Urology Associates and Sargent and Heppe Urology. He has served as past chief of urology section for Swedish Medical Center and Porter Memorial Hospital, chairman of the department of surgery for Swedish Hospital and chairman of the Swedish Hospital Quality Management Committee. From 2003-2005, Dr. Heppe served as president of the Rocky Mountain Urologic Society, which is Colorado’s official urologic society. He currently serves as president of TUCC Foundation and is a past member of the Colorado Board of Medical Examiners Committee on Anticompetitive Conduct. Dr. Heppe is a member of the American Urological Association, Colorado Medical Society, Denver Medical Society and the Rocky Mountain Urologic Society. Active in the community, Dr. Heppe served as president of the Denver Southeast Rotary Club from 2010 – 2011.

Dr. Heppe received a Bachelor of Arts degree from the University of Virginia and obtained his medical doctorate from the Medical College of Virginia. He then completed an internship in general surgery, along with his residency training in general surgery and urology, at the University of Colorado Health Sciences Center. Dr. Heppe is board certified by the American Board of Urology.

As a clinical instructor with the Swedish Hospital Family Medicine Residency program and past clinical instructor in the department of surgery at the University of Colorado Health Sciences Center, Dr. Heppe trains and educates future physicians in addition to his work at TUCC. He enjoys spending time with his wife and two boys. He also plays tennis and golf and enjoys skiing, hiking, biking and furniture making.

Dr. Heppe was recognized as a 2016, 2017, 2018, 2019, 2020 and 2021 Top Doc by 5280 Magazine in the category of reproductive endocrinology and infertility.

Lisa Zwiers, PA-C, is a physician assistant at TUCC. She specializes in female urinary incontinence, voiding dysfunction, managing complicated interstitial cystitis cases, urodynamic testing and interpretation – including video urodynamics – and neuromodulation programming. In addition, her clinical focus includes managing incontinence/overactive bladder when standard treatment therapies have failed, conservative management of vaginal vault prolapse and pessary therapy.

Lisa completed her Bachelor of Science degree in biology at the University of Nebraska. She then earned a Bachelor of Science physician assistant degree, with distinction, from the University of Nebraska Medical Center in Omaha. Prior to joining TUCC, Lisa worked in a variety of medical capacities including geriatrics, women’s health, family practice, urogynecology and urology.

Lisa is a certified physician assistant through the Colorado Board of Medical Examiners and the National Commission on Certification of Physician Assistants. She also serves as consulting faculty for sacral nerve stimulation programs and is an InterStim therapy clinical instructor.