Our Experts

Work with Industry Thought Leaders at Every Stage of Your Clinical Research Study

With so much at stake, you want the best minds focused on your clinical trial. ERG delivers, with teams of experts working on every facet.

Glen Apseloff, MD

Clinical Pharmacology / Human Abuse Potential

  • Founder and Investigator of Ohio Clinical Trials
  • Board Certified in Clinical Pharmacology
  • Holds degrees from Massachusetts Institute of Technology (MIT) and Ohio State University College of Medicine
  • Held numerous teaching positions in clinical pharmacology
  • On the editorial board of 3 peer review journals
  • 30+ years of clinical research experience
  • Participated in hundreds of studies
  • Authored over a hundred abstracts and publications
  • Hold two patents

Sarah D. Atkinson, MD

Pediatric Psychiatry

  • Founder, Finger Lakes Clinical Research
  • Investigator on 100 clinical trials in adult and pediatric CNS indications, including depression, ADHD, schizophrenia, bipolar disorder and anxiety
  • Often consults with international clients in the planning and design of study protocols
  • Coauthored two recognized texts in the treatment of psychiatric disorders
  • Authored and contributed to numerous books and peer-reviewed journals
  • Has held numerous teaching fellowships in both psychiatry and mathematics
  • Board certified in general psychiatry, child and adolescent psychiatry
  • Holds degrees from the University of Oklahoma (MD), Princeton University (MS), and Tulane University (BS)

Mark Brody, MD, CPI

Alzheimer’s disease

  • Medical Director and Founder of Brain Matters Research
  • Principal Investigator on more than 180 clinical trials seeking to prevent and treat Alzheimer’s disease (AD), mild cognitive impairment, dementia and stroke
  • Founded one of the largest clinical research facilities in the US specializing in AD diagnosis, treatment and research
  • Has a private practice in neurology
  • Nationally recognized expert in both AD and stroke
  • Served as Medical Director, Comprehensive Stroke Program-Bethesda Memorial Hospital
  • Certified by the Academy of Clinical Research Professionals as a Certified Physician Investigator
  • Holds degrees from the University of Calgary (MD) and the University of Western Ontario (BS)

Stacy Dilzer, RN, CCRC

Clinical Pharmacology / Renal and Hepatic

  • Founder and past President, Clinical Pharmacology of Miami
  • Sought-after operational leader in early-phase execution and study design for healthy volunteer trials
  • Industry expert in the management and operation of 100s of Phase I-IV clinical trials
  • Extensive career as a study coordinator, project manager, Director of Clinical Operations, Chief Compliance Officer and Vice President of Clinical Operations
  • Coauthored numerous articles pertaining to clinical pharmacology
  • Holds a BS, Nursing from Florida International University
  • Registered Professional Nurse

Daniel Gruener, MD


  • Chief Medical Officer, Evolution Research Group
  • Served as Medical Director and Principal Investigator at St Louis Clinical Trials
  • Has participated in 400 early- and late-phase clinical trials
  • Industry-leading expert in psychiatry, pain, addiction, diabetes and HAL
  • Past board member of the American Pain Society
  • Author of numerous publications
  • Worked for PRAHS; CRI Worldwide; Penn Friends Behavioral Health System; Northeast Neuroscience Institute; Philadelphia Pain Program
  • Board certified by the American Academy of Pain Management and the American Board of Psychiatry and Neurology
  • Holds an MD from American University and a BS, Psychology

David Leiman, MD

Analgesics, Acute & Chronic Pain

  • President – Analgesics, Acute & Chronic Pain
  • Co-founder of HD Research
  • Dr. Leiman is board-certified anesthesiologist.
  • Holds degrees from St. George’s University School of Medicine, UCLA Anderson School of Management (MBA), the University of Texas at Houston (MD)
  • a Clinical Assistant Professor with the Department of Surgery at the University of Texas at Houston
  • Board Certified in Anesthesiology

Harold Minkowitz, MD

Analgesics, Perioperative & Hospital Based Research

  • President – Analgesics, Perioperative & Hospital Based Research
  • Co-founder of HD Research
  • Over 25 years of clinical experience.
  • He has conducted over 240 studies
  • Has published and lectured extensively on anesthesia and pain
  • Adjunct Associate Professor, University of Texas, Department of Anesthesiology and Perioperative medicine.
  • Hold Degrees from Hillbrow Hospital and The University of the Witwatersrand (MD), Johannesburg, South Africa
  • Board-certified in Anesthesiology

Sherwyn Schwartz, MD


  • Senior Medical Lead, Metabolism and Endocrinology, Evolution Research Group
  • Has conducted 1200 studies, primarily in NASH, diabetes and endocrinology
  • Published 225 papers and authored three books
  • Expert in conducting clinical research in diabetes, NASH and other indications in endocrinology and metabolism
  • Founder and Former Director of DGD (Diabetes & Glandular Disease Research Associates), San Antonio, Texas
  • Holds degrees from the University of Illinois (MD, BS)

Stephen Thein, PhD

Alzheimer’s disease
Sleep disorders

  • Director, Principal Investigator and Founder of Pacific Research Network
  • Industry-leading researcher in the fields of sleep disorders, Alzheimer’s disease, and dementia
  • Has conducted over 380 trials testing new medications to treat Alzheimer’s disease, memory loss, anxiety, migraine, sleep disorders, sexual dysfunction, social anxiety, multiple sclerosis and weight loss
  • Sought-after lecturer on topics related to the central nervous system/neurology and sleep disorders
  • Authored over 20 journal articles and scientific abstracts in several peer-reviewed journals
  • Holds degrees from the United States International University (PhD; MA, Human Behavior) and California Western University (BA)