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.
Patrick Lee, MD is a co-managing member at PAI. Dr. Lee joined PAI in 2001 and specializes in the healthcare sector. Dr. Lee is currently an adjunct professor in the Department of Radiology at Stanford University.Dr. Lee received a bachelor of arts in economics from Northwestern University, a doctor of medicine from Duke University School of Medicine and an MBA from Duke Fuqua Business School.
John Doux, MD joined PAI in 2004 and is a board certified dermatologist. Dr. Doux specializes in the healthcare sector. Dr. Doux received his BS and MD from Stanford University. He received his MBA from the Wharton School of Business at the University of Pennsylvania.
Charles Cho, MD joined PAI in 2008 and specializes in the healthcare sector. Dr. Cho is a practicing board certified neuromuscular specialist and serves on the faculty at the Stanford Medical Center where he is is the Director of the Amyotrophic Lateral Sclerosis Clinic. Previously, Dr. Cho was a Clinical Instructor at the Harvard Medical School. Dr. Cho brings research and clinical knowledge as well as experience in the private equity markets to PAI. Dr. Cho received his bachelor of science from Brown University and his doctor of medicine from Georgetown University School of Medicine. He completed his residency at Stanford and did a post-graduate fellowship at Massachusetts General Hospital.
The Operations and Administration team includes Karen Trailer, Chief Administrative Officer, Angela Nguyen-Dinh, CCO, Diana Vo, Investor Relations Manager, Mina Iskander, Controller and Gauri Bhardwaj, Trade/Operations Analyst. Together this team ensures timely, accurate and compliant reporting of client and portfolio records.
Angela Nguyen-Dinh, joined PAI in 2014, and has over 13 years of financial experience in trading and operations. Prior to joining PAI, Ms. Nguyen-Dinh served as the Operations Manager and a trader at Ascend Capital LLC focusing on process improvement and technology. Before Ascend, she worked an Associate at Goldman Sachs where she traded for proprietary private wealth products.Ms. Nguyen-Dinh received her bachelors of science in finance from University of Utah.
Diana Vo, joined Palo Alto Investors in 2013 as its Investor Relations Manager and has over 18 years of experience in financial services in various areas including fund administration, operations and trading. Prior to joining PAI, Ms. Vo was Director of Investor Relations at Conifer Fund Services. Before Conifer she managed the Client Operations group at Mellon Capital Management. Ms. Vo received her bachelor of arts in economics and political science from Barnard College.
Mina Iskander, joined Palo Alto Investors in 2016 and has over 10 years of experience in accounting and finance. Prior to joining PAI, Mr. Iskander served as Controller at Apex Capital LLC. Before Apex, he worked at EisnerAmper auditing various hedge funds and broker dealers. Mr. Iskander received his bachelors of science in business administration from California State University-East Bay.
Gauri Bhardwaj, joined Palo Alto Investors in 2016 and has over 14 years of experience in trading and operations within the financial services industry. Prior to joining PAI, Ms. Bhardwaj worked at Wellington Management Company LLP in both Boston and San Francisco holding various roles in operations, fixed income trading, and business development. Ms. Bhardwaj received her bachelors of science in business administration and Master’s in Business Administration from Boston University.
Karen Trailer, joined Palo Alto Investors in 1994 and has been instrumental in building the company. As PAI’s chief administrative officer, she is responsible for overseeing administrative and office operations. She also manages the company’s human resources and payroll as well as internal and external events, including PAI's client conference. Prior to joining PAI, Ms. Miyake-Trailer was a realtor and property manager for Adobe Capital Corporation. She has served as office manager of Korn/Ferry International and as district manager of Nissan Motor Corporation. From 1966 to 1968 she attended Idaho State University, where she also worked with Outward Bound. She is a member of Alpha Chi Omega, and her other interests include clothing design and golf.
Jennifer Trailer, has served Palo Alto Investors and its clients for more than twelve years in operations. She supported and subsequently led the operations team during a period when the firm experienced significant growth. Currently, Ms. Trailer supports the research side of the firm, including Dr. Joon Yun, and Dr. Patrick Lee, co-managers of PAI.Ms. Trailer earned her bachelor of science degree, with honors, from San Jose State University with a concentration in dietetics. While in college Ms. Trailer volunteered in the Dietetics Department at Valley Medical Center.
Sarah Alfaro, joined PAI in 2016 and is the assisting support for our clients and research side of the firm, including Dr. John Doux, Dr. Charles Cho, and Dr. Rakesh Marwah. Mrs. Alfaro has over 10 years’ experience in customer service. Prior to joining PAI she worked as a Project Manager at DocuSign where she was awarded for her passion in client services and assisting others.