Donna Behring, MS

President & CEO

Donna is the Founder & Chief Executive Officer of The Clinical Research Group, Inc. since 2000, and currently Site Director at San Juan Bautista School of Medicine/Clinical Research Unit and Strategic Partner with Puerto Rico Consortium for Clinical Investigation(PRCCI). Donna has a Masters of Science.

Rickey Parks

Director of Regulatory & Clinical Operations
Sr. Study Coordinator 

Education Background:

  • Graduated from Concorde Career Institute in 2007 in the top 1% of his class


  • Completed over 45 clinical trials in a variety of indications.

  • 18 years of management experience 10 of this in the Clinical Research Field.

Contact information:

Sahar Ashraf, MD.

Lead Study Coordinator/Manager for Psychiatric sites

 Education Background: 

  • US at Baylor University Hospital, Dallas.


  • Neurophysiology Research focused on early diagnosis of sub clinical seizures

  • Pharmacogenetics

  • Cardiovascular

  • Internal Medicine and Psychiatry Studies (Dementia, Alzheimer and Depression and Cognitive Impairment)

  • EEG

  • TMS

  • Other Polysomnography procedures

Contact information:

Bryce Gammill

Finance Manager

Education Background:

  • Bachelor of Business Association (BA) in Finance - Neeley School of Business, Texas Christian University 


  • Financial reports

  • AR/AP

  • Payroll

  • Financial forecasting

  • Business development

  • Contracts

Contact information:

Dr. Lusdian Casanova

Clinical Operations Manager

Clinical Research Unit/SJBSM - Caguas, PR

Education Background:

  • Bachelor in Biology with a Minor in Anatomy and Physiology

  • Doctor in Medicine

Contact information:

Juan Antonio Marrero Jimenez

Clinical Research Coordinator, Patient Recruitment & Social Media Manager

Education Background:

  • Bachelor Degree in Computer Engineering​

Studies involve: All PR studies​

Contact information:


Business Operations

Education Background:

  • Bachelor of Business Administration (BA)  - McLane College of Business, University of Mary-Hardin Baylor 


  • Marketing

  • Medical TMS Device Technician

  • Business Development

  • Patient Relations

Contact information: