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TUCC | The Urology Center of Colorado Logo

Lone Tree Urology Center

TUCC | The Urology Center of Colorado | Lone Tree Logo

Holiday Hours

May 27th – Closed
July 4th – Closed
September 2nd – Closed
November 28th and 29th – Closed
December 24th – Closing at 3pm
December 25th – Closed
January 1st – Closed

Areas Served

TUCC Lone Tree serves locations in and around southeast Denver, including Lone Tree, Englewood, Parker, Centennial, Highlands Ranch, Littleton, Castlewood, Southglenn, Greenwood Village, The Denver Tech Center, Stonegate, Castle Pines, Castle Rock, Cottonwood, Dove Valley, Foxfield, and Roxborough Park. 

TUCC Lone Tree is conveniently located off Yosemite Street, near 1-25 and Lincoln Avenue.

Meet Our Doctors

Best Urologists in Lone Tree

At TUCC’s Lone Tree Urology Office, we’re proud to offer the most comprehensive urology care in southeastern Denver. Our services are delivered by doctors passionate about giving men and women extraordinary care and optimal outcomes in a compassionate, simplified, streamlined process.

Learn More About Our Providers

Our Urologist Services

Christopher Dru, M.D., joined TUCC in September 2018. He completed his Urology Residency and Research Fellowship in Urologic Oncology at Cedars-Sinai Medical Center in Los Angeles, CA. In addition to General Urology, he has specialized training in da Vinci Robotic Surgery, Kidney Stone Disease, Urologic Oncology, Female Prolapse/Incontinence, BPH, and Endourology.

Dr. Dru earned his Doctorate in Medicine at Loyola University Chicago Stritch School of Medicine. He has a B.A. in Chemistry from the Honors Program at the University of San Diego where he graduated Summa Cum Laude and Phi Beta Kappa. In his free time, he enjoys the skiing, fly fishing, golf, tennis, cooking, and spending time with his family.


  • Robotic Surgery
    • prostate, kidney, ureter, bladder, vagina, uterus
  • Kidney Stone Disease
  • Urologic Oncology
  • Female Pelvic Organ Prolapse and Urinary Incontinence
  • BPH and Endourology

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.


  • Male infertility (including microTESE and testicular FNA mapping)
  • Vasectomy reversal
  • Microsurgical varicocelectomy and spermatic cord denervation
  • Erectile dysfunction (including penile prosthesis)
  • Peyronie’s disease
    Male incontinence
  • Benign prostatic enlargement

Before joining TUCC, Richard Heppe, M.D., practiced with Colorado Urology Associates and Sargent and Heppe Urology.

He has served as the Chief of Urology for Swedish Medical Center and Porter Memorial Hospital and chairman of Swedish Hospital’s surgery department. In addition, Dr. Heppe chaired Swedish Hospital’s Quality Management Committee.

From 2003 to 2005, Dr. Heppe served as president of Colorado’s official Rocky Mountain Urological Society.

He currently serves as president of the TUCC Foundation and is a past member of the Colorado Board of Medical Examiners Committee on Anticompetitive Conduct. Dr. Heppe is also a member of the American Urological Association, Colorado Medical Society, and Denver Medical Society. 

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Active in the community, Dr. Heppe served as the Denver Southeast Rotary Club president from 2010 to 2011.

Dr. Heppe received a Bachelor of Arts degree from the University of Virginia and his medical doctorate from the Medical College of Virginia. He then completed an internship in general surgery and 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 a past clinical instructor in the surgery department 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 reproductive endocrinology and infertility category.


  • Minimally Invasive Prostate Surgery
  • Transurethral Microwave Therapy (TUMT)
  • High-Powered Greenlight Laser Prostate Vaporization
  • Posterior Tibial Nerve Stimulation
  • Monarc Transobturator Sling
  • Laparoscopic Surgery
  • Hand-Assisted Laparoscopic Nephrectomy
  • Endourology
  • Percutaneous Nephrolithotripsy
  • Ureteroscopy and Ureteroscopy with Holmium Laser
  • Extracorporeal Shockwave Lithotripsy (ESWL)
  • Prostate Disease
  • Vasectomy and Vasectomy Reversal
  • Male Fertility and Microsurgery
  • Men’s Urologic Health
  • Penile Implants

Key Accomplishments

Marklyn (Mark) Jones, M.D., dedicates his practice to robotic surgery using da Vinci Robotic Surgery. He has performed thousands of minimally invasive surgeries for TUCC patients since August 2007.

Dr. Jones serves as the primary laparoscopic donor nephrectomy surgeon for the Presbyterian/St. Luke’s Medical Center Kidney Transplant Center.

Dr. Jones is a member of several professional organizations, including the American Urological Association, Endourologic Society of America, Rocky Mountain Urological Society, Denver Medical Society, and the Colorado Medical Society.

He’s authored many peer-reviewed journal articles and presented on several occasions at the annual meeting of the American Urological Association.

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Dr. Jones is board certified by the American Board of Urology.

Dr. Jones earned a Bachelor of Science degree in biology cum laude and his medical doctorate from Creighton University.

Dr. Jones was inducted into the Alpha Omega Alpha (AOA) Honor Medical Society during medical school. He completed his internship and residency training at the University of Minnesota, where he was named chief resident for the department of urologic surgery.

Dr. Jones also completed his fellowship training in advanced laparoscopy, robotic surgery, and urologic oncology at the University of Minnesota.

While performing his training at the University of Minnesota, Dr. Jones was a clinical instructor, training urology residents and community urologists on the da Vinci robot.


  • Robotic Surgery with the Da Vinci Robot®
    • Nerve-sparing prostatectomy, Partial nephrectomy, Radical nephrectomy, Pyeloplasty Radical cystectomy, Pelvic lymph node dissection
  • Advanced Laparoscopic Surgery
    • Pure-laparoscopic nephrectomy, Partial nephrectomy, Laparoscopic renal cryoablation, Nerve-sparing prostatectomy, Pelvic lymph node dissection

Key Accomplishments

He completed his internship in General Surgery and Residency in Urology at Lahey Hospital and Medical Center outside of Boston, MA.

In addition to General Urology, he has training in Kidney Stone Disease, Endourology, BPH (including minimally invasive UroLift®), Urethral Stricture Disease, Erectile Dysfunction/Peyronie’s disease, and male and female incontinence.

Dr. Kaufman earned his Doctorate in Medicine at Northwestern University’s Feinberg School of Medicine in Chicago. In addition, he has a B.A. in Psychology from Northwestern University.

Before his medical training, Dr. Kaufman worked in the consulting industry, optimizing quality and cost-effectiveness in healthcare delivery. He enjoys hiking, skiing, fly fishing, golf, tennis, cooking, and woodworking in his free time.


  • Erectile Dysfunction
  • Endourology
  • Kidney and Ureteral Stone Disease
  • Male and Female Incontinence
  • Peyronie’s Disease
  • Prostate Disease, including Prostatitis and BPH
  • Urethral Stricture Disease, including Urethroplasty
  • UroLift
  • No-Scalpel Vasectomy

Prior to the merger that formed TUCC, Juan Montoya, M.D., practiced with Colorado Urology Associates for more than five years. He is a member of the American Urological Association, South Central Section of the American Urological Association, Denver Medical Society, Rocky Mountain Urologic Society and is a fellow of the American College of Surgeons.

Dr. Montoya received a Bachelor of Arts degree from the University of Texas at Austin. He earned his medical doctorate from the University of Texas Southwestern Medical School. Following graduation, Dr. Montoya completed an internship in general surgery at the University of Maryland Medical Center. He then completed his urology training at the University of Texas Southwestern Medical Center/Parkland Memorial Hospital. Dr. Montoya is board certified by the American Board of Urology.

Fluent in Spanish, Dr. Montoya practices a full spectrum of general urology with a special emphasis on robotic and laparoscopy surgery.


  • Robotic Surgery
    • Nerve sparing prostatectomy, Pyeloplasty
  • Laparoscopic Surgery
    • Nephrectomy
  • Neurogenic Bladder and Voiding Dysfunction
    • Care of patients with spinal cord injuries, Sacral nerve stimulation (Interstim)
  • Endourology
    • Extracorporeal shockwave lithotripsy, Percutaneous nephrolithotripsy, Ureteroscopy with Holmium laser

Key Accomplishments

Former U.S. Navy Medical Corps Lieutenant Commander John Tillett, MD FACS, practiced urology in the military and a private practice in Florida before joining TUCC in 2016.

He is currently an assistant professor at the University of Colorado School of Medicine and the director of the Urology Training for the Swedish Medical Center General Surgery residency program.

Dr. Tillett 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.

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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 among the top five urology providers in the Navy who were ranked for satisfaction by outpatient clinic patients. In addition, 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, traveling, tennis, and college football.


  • Male Infertility & Microsurgery
  • Stone Disease
  • Chronic Testicular Pain
  • Robotic Kidney Surgery
  • Men’s Urologic Health
    • Erectile dysfunction & Testosterone replacement

Key Accomplishments

Caitlin Ellis 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 of Physician Assistant Studies degree at Grand Valley State University in Grand Rapid, MI. Before joining TUCC, Caitlin worked in urology and primary care in Denver.

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 the American Urological Association.

Our Services

At TUCC’s Lone Tree location, we specialize in exceptional urologic care in a comfortable, professional, and compassionate setting. Our comprehensive services include multidisciplinary care for:

  • Sexual conditions
  • Male fertility problems
  • Female urology
  • Kidney stones
  • Benign prostate conditions
  • Cancer of the prostate, kidney, testes, bladder

Men's Urologic Services

We diagnose and treat various conditions impacting men’s urological health, including sexual health, male reproductive health, and urologic oncology.

TUCC specialists are masters in their unique areas of expertise, so they offer you a deeper understanding and proficiency of all men’s urologic health treatment options, as well as incontinence, kidney stones, prostate cancer, surgery, and radiation oncology.

See All Men's Services
  • Bladder Health
    • Bladder Cancer
    • Neurogenic Bladder
    • Urinary Incontinence
  • Prostate Health
    • Benign Prostatic Hyperplasia
    • Prostate Cancer
    • Penile Rehabilitation
    • Prostatitis
  • Erectile Dysfunction
    • Penile Implants
    • Penile Rehabilitation
    • Peyronie’s Disease
  • Testicular Health
    • Testicular Cancer
    • Testicular Implants
  • Low Testosterone
  • Male Fertility
    • Impotence
    • Male Fertility Post Spinal Cord Injury
    • Microsurgical Sperm Extraction
    • Microsurgical Varicocelectomy
  • Vasectomy
  • Vasectomy Reversal
  • Premature Ejaculation
  • Urinary Health
    • Kidney Stones
    • Urinary Incontinence
    • Urinary Tract Infections
  • Hematuria
  • Kidney Stones

Women's Urologic Services

Women have specialized urological needs—and TUCC Lone Tree has vast experience caring for women and meeting those needs with precision.

Whether you suffer from recurring urinary tract infections, incontinence, or kidney stones, we offer women the latest therapy options and treatments.

We provide quality care in a comfortable, private setting with state-of-the-art technology and friendly staff.

See All Women's Services
  • Bladder Health
    • Bladder Cancer
    • Interstitial Cystitis
    • Neurogenic Bladder
    • Urinary Incontinence
  • Urinary Health
    • Kidney & Ureteral Stones
    • Urinary Incontinence
    • Urinary Tract Infections
  • Vaginal Health
    • Vaginal Vault Prolapse
    • Vaginal Fistula
  • Hematuria
  • Kidney & Ureteral Stones

Insurance Accepted

TUCC Lone Tree accepts plans issued by an expanding array of insurance companies. 

*Some plans will require a referral for coverage and are noted. This list and accompanying insurance coverage specifications are subject to change and not a guarantee of payment.


TUCC | Lone Tree FAQs

Your primary doctor will likely refer you to a urologist for any specialized care. However, you should see a urologist if you suffer from any symptoms related to your bladder, kidneys, adrenal glands, or genitourinary system.

Our doctors will thoroughly explain what to expect with any treatment or procedure. Your comfort is paramount to what we do at TUCC. We strive to ensure that our procedures are performed with innovative techniques that make our patients as comfortable as possible.

You can reduce your risk of experiencing urological problems by maintaining a healthy weight, exercising regularly, avoiding tobacco products, and limiting caffeine and alcohol. However, it is essential to remember that not all urological issues can be prevented. 

Our experts will help you understand your coverage, deductibles, and out-of-pocket expenses before every procedure.

All urologists must complete four years of medical school and a minimum of two years of general surgical training. This standard is followed by four years of specific training in their urological specialty. As a result, the doctors at TUCC are often the most trained, experienced, and highly skilled in Colorado.

Urological treatment is not just for men. While urologists treat many conditions specific to men—such as prostate cancer and erectile dysfunction—urologists at TUCC also treat a range of conditions specific to women. This includes urinary tract infections (UTI) and conditions related to bladder health and vaginal health.

We’re here to help.

For appointments at any TUCC location, request an appointment online.