hims medical advisors

Peter J. Stahl, MD

Peter J. Stahl, MD is the Director of Male Reproductive and Sexual Medicine at NewYork-Presbyterian Hospital/Columbia University Medical Center and Assistant Professor of Urology at the Columbia University College of Physicians and Surgeons. He completed his undergraduate studies at Cornell University, where he played competitive tennis. Dr. Stahl subsequently attended medical school and completed his urology residency at NewYork Presbyterian-Hospital/Weill Cornell Medical College in New York City. Following residency, he completed two years of fellowship training in male reproductive medicine and microsurgery under the world-renowned Marc Goldstein, MD and Peter Schlegel, MD at the Center for Reproductive Medicine and Microsurgery at Weill Cornell. He received additional training during fellowship in male sexual medicine and penile prosthetic surgery from world-renowned expert John Mulhall, MD at Memorial Sloan-Kettering Cancer Center.

Dr. Stahl's practice is focused on the medical and surgical treatment of male subfertility, sexual dysfunction and low testosterone. He has special interest and training in minimally invasive and microsurgical techniques for surgical sperm retrieval in obstructive and nonobstructive azoospermia, microsurgical varicocelectomy, vasectomy, vasectomy reversal, implantation of testicular and penile prostheses, treatment of Peyronie's disease, and testosterone replacement therapy. He also treats patients with general urological issues including benign prostatic hyperplasia (BPH) and urinary stone disease.

Dr. Stahl's academic interests include the genetics of male subfertility, development of new diagnostic tests to guide the treatment of subfertile men, fertility preservation for male patients with cancer, and the effectiveness of varicocelectomy for the treatment of testicular dysfunction. He was the recipient of the prestigious Research Scholar Award from the American Urological Association Foundation and has authored more than 20 articles and book chapters in the field of reproductive and sexual medicine. His research and discoveries have been published in leading journals including Fertility and Sterility, Journal of Urology, Urology, British Journal of Urology International, and Annual Review in Medicine. He was the 2012 recipient of the Arnold Belker Fellowship, given by the Society for the Study of Male Reproduction in recognition of accomplishment and leadership potential in male reproductive medicine.


Arash Mostaghimi, MD MPA MPH

I am an assistant professor of dermatology, director of the inpatient dermatology consult service, and co-director of the Complex Medical Dermatology Fellowship at Brigham & Women’s Hospital.  My research focuses on understanding variations in dermatologic care and improving care delivery to optimize resource utilization, encourage patient autonomy, and reduce disparities. My specific interests include (1) reducing unnecessary diagnostic testing and drug monitoring within dermatology, (2) understanding the interface between dermatology and other medical specialties, (3) determining best practices for the treatment of orphan dermatologic conditions, and (4) characterizing dermatologic practice patterns, utilization, and costs.

My daughter has alopecia areata, and a portion of my research is focused on understanding the epidemiology and clinical impact of this disease.  In addition I am involved in clinical trials focused on bringing innovative therapies for alopecia areata to patients who need them the most.


Justin M. Ko, MD MBA

Dr. Ko joined Stanford Medicine in 2012 and serves as Medical Director and Chief of Medical Dermatology for Stanford Health Care. He is active in a number of leadership roles within the organization, and is intimately involved in various strategic and operational initiatives at SHC. 

Dr. Ko spearheads efforts around community outreach, screening and digital health. His passion for early cancer detection improving care delivery drives his efforts and collaborations to leverage advances in machine learning and artifical intellegence to increase the breadth of populations that can be reached. Some of this work is featured in Nature; more details can be found here: http://cs.stanford.edu/people/esteva/nature/. Further, he developed and runs a virtual teledermatology care delivery program at SHC; providing virtual visits for established patients and remote consultations for providers within the Stanford network. He welcomes opportunities to discuss and collaborate in these areas of investigation.

Dr. Ko has also been driven to find new treatments for alopecia areata, an immune-mediated condition that can progress to total hair loss. He and his team recently completed a seminal study that has help to spur further trials investigating the potential of novel agents in treating alopecia areata: https://insight.jci.org/articles/view/89776 For more information on ongoing clinical trials, please email: alopeciatrials@stanford.edu. Dr. Ko sits on the clinical research advisory board of the National Alopecia Areata Foundation. 

He graduated magna cum laude from Harvard University and worked in investment banking; mergers and acquisitions at JP Morgan before going on to earn a combined medical and business degree at Tufts University. During medical school, he was a member of the Alpha Omega Alpha honor society. Dr. Ko then performed his residency at the Harvard Combined Dermatology Residency Training Program where he served as chief resident in his final year. He is board certified in dermatology by the American Board of Dermatology.


*these physicians are advisors and not actual providers. All providers are medical doctors licensed in the state that the patient resides. 

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