Evanston Premier Healthcare Research


Jeffrey G. Geohas, MD  President/Medical Director

Dr. Geohas is the Medical Director of Evanston Premier Healthcare Research and Principal Investigator for clinical trials research.  Dr. Geohas has conducted over 300 clinical trials.  His areas of interest include lipids, Type 2 Diabetes, and weight loss studies.

Dr. Geohas is  board certified in internal medicine.  In addition to directing EPHR, Dr. Geohas is currently an internist in private practice in Evanston, Illinois.  Dr. Geohas graduated with degrees in neurobiology and physiology from Northwestern University and received his Doctorate of Medicine from Northwestern University Medical School.  He completed his Internal Medicine residency at Evanston Northwestern Healthcare-Department of Medicine, Northwestern University Medical School.

Dr. Geohas is currently an instructor in  Clinical Medicine at the University of Chicago Pritzker School of Medicine.

Dr. Geohas was formally a Clinical Investigator, then the Medical Director at the Radiant Research Chicago Center for Clinical Research.

Click here for a list of publications authored and co-authored by Dr. Geohas.

Click here for Dr. Geohas Curriculum Vitae


Yijia Geohas, MS, MBA    Site Director

Yijia Geohas is the Site Director and Research Coordinator for Evanston Premier Healthcare Research and is  also a Sub Investigator on clinical trials.  Mrs. Geohas received her BS in Computer Science and Mathematics from Mount Mercy College,  her MS in Mathematics and Computer Science from the University of Iowa and her MBA from the University of Chicago.  Prior to joining EPHR, Ms. Geohas was a software developer for UBS Investment Bank, Cambridge Technology Partners and Decisionmark, Inc.

Mrs. Geohas has received certification in Biomedical Research, CITI Good Clinical Practice, CITI Health Information Privacy and Security (HIPS) for All Researchers, Medidata Balance and Logistics for Site Users, RAVE 5.6 EDC Essentials Clinical Research Coordinators (Akros), Phase Forward Inform EDC, Version 4.6 and Transport of Dangerous Goods, Sfe-T-Pak, Inc.

Click here for Yijia Geohas Curriculum Vitae