After completing his residency and fellowship at University of California, San Francisco (UCSF), Breyer joined the faculty of Urology in 2011. The following year, Breyer led the largest study looking at major and minor "genitourinary" injuries amongst 142,144 U.S. adults went to emergency rooms from injuries caused by clothing, furniture, tools and toys between 2002 and 2010. He followed up this study in 2019 by using
GoFundMe to study the most popular crowdfunding projects on the website. His research team found that cancer patients raise approximately a quarter of their goal of $10,000 using GoFundMe. By 2014, Breyer was appointed chief of urology at
San Francisco General Hospital, succeeding Jack W. McAninch, his mentor and fellowship director. In addition to his role as chief, Breyer continued to direct the UCSF male genitourinary reconstruction and trauma surgery fellowship. According to ExpertScape, Breyer is one of the top experts in urethral stricture disease and treatment worldwide. During the
COVID-19 pandemic in North America, Breyer was named Residency Program Director and Associate Chair of Education for the Department of Urology. ==References==