Physicians

Dr. Alan Frischer, MD

Internal Medicine

Dr. Alan Frischer earned his M.D. and MPH degrees from the University of California, San Francisco School of Medicine.  He then completed Internship and Residency at UCLA.  He has practiced Internal Medicine in Downey ever since, and started Frischer Medical Group in 1997 with Dr. William Sim and Dr. Bill Kim.  He is former chief of staff and former chief of medicine at Downey Regional Medical Center, and has received awards and recognition for his long-time dedication to the community of Downey.

Dr. William Sim, MD

Internal Medicine

Dr. William Sim earned his M.D. from Stanford University School of Medicine.  He then completed Internship and Residency at UCLA.  

He is fluent in Korean.

Dr. Laura Frischer Ryan, MD, FACP

Internal Medicine

Dr. Laura Ryan earned her M.D. from the Robert Larner College of Medicine at the University of Vermont, where she was recognized for her outstanding commitment to patient care.  She completed Internship and Residency at Kaiser Permanente, Los Angeles Medical Center - UCLA, and joined Frischer Medical Group in July 2017.  In 2020, she was elected to Fellowship in the American College of Physicians, an honor given for excellence and contributions made to both medicine and to the broader community.

She is fluent in Spanish.

11480 Brookshire Ave, #200, Downey, CA 90241                                       Phone: (562) 806-0874​