Our Team2019-04-02T13:41:29-07:00

ASUrology Team


Dr. Howard Tay is certified by the American Board of Urology and is an active member in the American Urological Association.

He has been practicing urology in Arizona since 1996.  In 2012, he founded Arizona State Urology in order to provide a more comprehensive and personable experience for his patients.

Beside being awarded with several “TOP DOC” recognitions by Phoenix Magazines , he has served on numerous hospital committees as well as being a past Department Chair of Surgery at Banner Thunderbird Hospital..

In addition, he has educated numerous medical students and physician assistant students from our local institutions including: Midwestern University, Northern Arizona University and the University of Arizona Medical School-Phoenix Campus.


Mark Hong, MD, FACS, is a Phoenix native, Board-certified urologist. His practice principles are integrity, respect and compassion. Upon graduating Stanford Medical School, Dr. Hong finished urology residency at Harvard Medical School and robotic surgery fellowship at George Washington University.

Dr. Hong is internationally recognized for his pioneering work in BPH and prostate diseases, including one of the world’s largest experiences of Greenlight laser surgery and Urolift for BPH in the office setting. A Physician of the Year nominee, Dr. Hong has been featured on WebMD, ABC, CBS, NBC, Fox News, PBS, the Arizona Republic and was elected “Top 40 under 40” by Phoenix Business Journal. 

A classically trained violinist and Taekwondo black belt, Dr. Hong cherishes balance in his life by spending time with his wife and infant daughter, marathoning and supporting local causes.

Dr. Hong is a founding Board member of Arizona Diamondbacks CEO Derrick Hall’s Pro-State Foundation, which supports families with prostate cancer.  

Douglas Masson M.D. FACS

Dr .Masson is a urologist with 20 years of experience who believes in a humanistic approach to taking care of his patients.

Established in 2016.

Dr Masson is a board certified urologist that specializes in diseases of the urinary tract including prostate, kidney and bladder cancer, kidney stones, incontinence of urine and vasectomy. Dr Masson also treats Erectile Dysfunction. He performs many surgeries using the Da Vinci Robotic system, and is happy to discuss any of the above topics with you at your appointment.

SDr Masson has been practicing urology for 19 years and recently moved to the Phoenix area and is now working at Arizona State Urology with Doctors Howard Tay, Logan Wineland, and Y. Mark Hong. Dr Tay has been in practice in the Valley of the Sun since the late 1990’s. You can always expect honest, personal, and outstanding treatment from the staff and each of the doctors.

Yasmin Bootwala M.D.

Yasmin Bootwala is a board-certified urologist with fellowship training in Urinary Tract Reconstruction and Pelvic Floor Surgery. After completing medical school at Baylor College of Medicine, she completed a five-year residency at Emory University in Atlanta and a 2-year reconstructive fellowship at MD Anderson in Houston.  She has an extensive open and minimally invasive surgical training and enjoys treating all aspects of urology with a particular interest in pelvic floor surgery and voiding dysfunction.  Dr. Bootwala believes in strong patient doctor communication, treating every patient with personalized care, shared decision-making and authentic informed consent.

Dr. Bootwala is an active professional member of the Society of Urodynamics, Female Pelvic Medicine, & Urogenital Reconstruction (SUFU), the Society for Women in Urology (SWIU), and the American Urological Association (AUA).  She collaborates with Dr. Crista Johnson-Agbakwu and Arizona State University on research efforts pertaining to Optimizing Healthcare for Women affected by Female Genital Cutting.  She assists with Cultural Competency workshops and surgical workshops for University of Arizona medical students.

Dr. Bootwala has a strong interest in global health and surgery.  She worked in Uganda with International Volunteers in Urology as well as performed complex fistula repairs in Sierra Leone in partnership with the West Africa Fistula Foundation.

Happily married with two young boys, she enjoys traveling avidly with her family and exploring the outdoors on foot, by boat, by bicycle, or by car.  Her travel adventures have taken her as close as the Phoenix canal system and nearby Joshua Tree and as far away as Sapa, Vietnam.

Natalie Kahle, FNP-C

Recipient of The Florence Nightingale Award and The Daisy Award for Extraordinary Nurses, Natalie Kahle seeks to give you the VIP treatment at Arizona State Urology – Ironwood Cancer & Research Center, by specializing in the holistic needs of patients with urological concerns. This multi-award winning, nationally certified family nurse practitioner has 13 years of nursing experience in primary care, emergency medicine, trauma intensive care, pulmonary medical-surgical, and geriatrics. Natalie’s first-class care approach started long before her career in nursing began. As a mom, former flight attendant of nine years, and adjunct nursing professor, she brings her lifelong commitment of compassionate care giving to Arizona State Urology – Ironwood Cancer & Research Center. As a family nurse practitioner, she does so much more than diagnose and treat conditions. Natalie uses a patient-centered approach to educate you on how to prevent illness, so you can live at the highest point of your own wellness continuum. During your first consultation, you can expect a visit that is mindful of your personal preferences and involves you in your own customized plan of care. This enables Natalie to fully empower each and every patient with an individualized education. With Natalie, you’ll always be encouraged to make informed decisions about your healthcare.

Happily married with a beautiful daughter who is actively involved in ballet, tap, contemporary, jazz and track, Natalie enjoys spending time with her family.


Welcome and thank you for considering Arizona State Urology as your premiere center of urological care.Every patient in our practice is special and unique.  We will always strive to make sure that your visit with us is a personable and caring experience. With your input and our access to the latest urological technologies, we will come up with a comprehensive treatment plan to address your every need.


Follow Us On Social Media