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About Us Team Philosophy
People are our greatest asset. Our goal is to ensure the success of every Palo Alto Investors team member, which will, in turn, make our clients successful.


Palo Alto Investors employs twelve professionals at our offices in Palo Alto. At the center of our company is our experienced team of five research analysts who have extensive industry experience, market knowledge, and clinical expertise in the healthcare sector. The PAI research team has more than 65 years of collective investment experience.

Joon Yun, MD, CFA is a co-managing member and the president of PAI. Dr. Yun joined PAI in 1998 and specializes in the healthcare sector. Dr. Yun brings clinical expertise as well as medical industry experience to PAI where he focuses primarily on the evaluation of pharmaceutical, medical device and biotechnology companies.

Dr. Yun was a physician at Stanford in the Department of Radiology where he served on the clinical faculty from 1995 to 2006. Dr. Yun received his bachelor of arts in biology from Harvard University and his doctor of medicine from Duke University School of Medicine.