Meet our dedicated team members.

North Texas Clinical Trials Investigators 


Brian Maynard, PhD

Principal Investigator

Dr. Maynard began his career in pre-clinical drug development, working on pharmacological methods of treating substance abuse. His educational career includes work in psychiatry and neurology, in both human and animal models of diseases. He has worked in clinical drug trials for over 15 years in both academic and industry settings and has served as a sub-investigator on over 100 industry sponsored studies. He began North Texas Clinical Trials in 2012 with the goal of bringing access to clinical trial opportunities to Tarrant County and beyond and provide timely and accurate to drug developers. He serves as Site Director and Principal Investigator. He resides in Dallas with his wife and two children.


Diana Ghelber, MD

Principal Investigator

Dr. Ghelber is a board certified general psychiatrist currently practicing in Fort Worth, Texas. She trained in general psychiatry at the University of Texas Health Science Center in Houston.

Dr Ghelber passed the written part of the American Board of Psychiatry and Neurology certification examination in May 2011 and the oral examination in January 2012. Special interests include treating patients with major depressive disorder, treatment resistant major depressive disorder, addiction to narcotics (opioids), anorexia nervosa and bulimia (eating disorders), insomnia, and post traumatic stress disorder (PTSD).

Dr. Ghelber also has Israeli general psychatry training and is board certified in adult psychiatry in Israel. In Israel, she worked for 18 years in various academic and clinical positions and was involved in the treatment of victims of terror attacks, Holocaust survivors, post-traumatic stress disorder (PTSD), patients with eating disorders, patients with bereavement; in geriatric psychiatry; and, as a director of a busy psychiatric emergency room, in various psychiatric emergencies.

Dr Ghelber is published in medical journals and presented at international psychiatrists meetings.


James WinN, MD

Texas native, Dr. James Winn, MD, is a board-certified Family Practice physician with years of experience in the practice of medicine and in physician leadership. He graduated from University of Texas in Galveston (UTMB) medical school and completed his residency training at UTMB Galveston University Hospital. Board certified by the American Board of Family Medicine in 1973, he has practiced medicine privately in both Ft. Worth as well as his hometown of Uvalde, Texas.

Dr. Winn has been appointed to and served on numerous boards and commissions. Dr. Winn's former leadership positions include Colonel (retired) of the Texas Army National Guard, Chief of Staff of Uvalde Memorial Hospital, and President and CEO of the Federation of State Medical Boards. He continues to be in a physician leadership position as the President of the UTMB Alumni Association Board of Trustees. Since retiring from his private practice in 2015, Dr. James Winn still enjoys to actively practice medicine and has taken a special interest in clinical research. He believes that the clinical research is changing the face of modern medicine and he closely follows the new developments.

In his free time Dr. Winn enjoys golfing, traveling and spending quality time with wife, Vicki, and their family, including their three shared daughters, son-in-laws-and their four fantastic grandchildren.


Erica Snook, MD

Erica Snook, M.D.

Dr. Snook graduated from the University of Texas Medical Branch School of Medicine in 2012. During medical school, she was inducted into theAlpha Omega Alpha Honor Medical Society for her academic achievements. She completed her residency in General Adult Psychiatry at the University of Texas Medical Branch in 2016. During residency, she was awarded the First Year Resident Teaching Award in 2013 and the Robert B. White Award for Clinical Excellence in 2015. She has coauthored publications on bipolar disorder and psychopharmacology. Dr. Snook is board certified by the American Board of Psychiatry and Neurology. She has special interests in bipolar disorder, ADHD, and addiction medicine.


Jessica Anderson

Jessica Anderson, CCRP

Just over nine years ago Jessica Anderson fell into her Clinical Research career by accident - as most of us in this industry do. Getting her start in a less than glamorous "office" the size of a broom closet sorting spit swabs and filing regulatory documents. Since those days she has contributed to over one hundred pharmaceutical trials ranging from phase I-IV and is credentialed by SOCRA. Jessica currently acts as the site manager for North Texas Clinical Trials, she truly enjoys wearing multiple hats a day and thrives in the ever changing, fast paced environment. Jessica is a firm believer in failing forward, the idea that education never stops, lives by a philosophy that every act and action effect the world, and urges everyone to never live the same day twice. Think like a proton, stay positive.