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Current Endocrinology Fellows


Xin Chen, MD

Medical School: University of Toledo
Residency: LAC+USC
Professional Interests: Pituitary and adrenal diseases, thyroid disorders
Hobbies/personal interest: Horror movies, cooking/baking


Alex Tyan, MD

Medical School: UT Southwestern
Residency: UC San Diego
Professional Interests: Diabetes, General endocrinology
Hobbies: Foodie, Milk tea, Aquascaping, Spending time with my corgi Eli


Johanna Gerwer, MD MPH

Medical School: Texas Tech Paul L Foster SOM
Residency: University of Texas Health Science Center at Houston 
Professional Interests: General Endocrine 
Hobbies: Hiking, Performing Arts, Family


Preethika Ekanayake, MD

Medical School: University of California, Davis
Residency: University of California, San Diego
Professional Interests: General endocrinology, hospital medicine, medical education and teaching
Hobbies: Yoga, hiking, traveling the world, gardening, cooking, reading, and hanging out with my family and my dogs, Budd-Chiari and Arnold-Chiari


 Robert Thomas, MD PhD

Medical School: UC San Diego
Residency: UC San Diego
Professional Interests: Mitochondrial metabolism, diabetes, autophagy, bone disease, vitamin D Personal Interests: History, cooking
Hobbies: Violin, tenor banjo, cycling, gardening


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UC San Diego Fellows go on to a broad range of careers. Recent fellows have taken positions at UCSF, Tufts, UC San Diego, Amylin Pharmaceuticals, and Quintile CRO. View our list of past fellows.