Where the experts come to work

For over two decades, ACT has been dedicated to assisting pharmaceutical companies find new cures to help patients better manage their healthcare.

Center Leadership

Patrick McLaughlin

Patrick McLaughlin

Chief Executive Officer

Patrick McLaughlin graduated with a degree in Business Administration from the University of Texas-Austin in 1999. Patrick’s entry into the clinical research space was in 1996, when he was recruited to a full-service, multi-specialty dedicated research site, as President. Three years into the position at the Institute of Clinical Research (ICR), sales were up 600% and the ownership group desired to sell the company.

In March of 1999, Patrick was the principal negotiator in arranging a deal that sold ICR to Protocare, a Site Management Organization. Protocare named ICR as one of their premier sites in Centerwatch and one in which other Protocare sites would be modeled after. Shortly after the sale, Protocare was acquired by Radiant Research and ICR to this day is one of Radiant’s leading sites nearly 23 years after its acquisition.

In May of 1999, Patrick started working at Advanced Clinical Research Institute in Anaheim, CA as its Executive Director. Patrick made a decision for the company to enter the Phase I sector after an entire history of exclusively conducting Phase II-IV studies at the facility. Dr. Dennis Riff and Patrick McLaughlin funded the purchase of an 8,800 square foot, dedicated Phase I facility in 2007, and re-branded the company as Anaheim Clinical Trials.

Through years of continued success and the need for additional investment to move the company to the next level and to a much larger state-of-the-art research facility, a decision was made to bring on an additional investment partner which was completed in February 2019. Patrick is now CEO of CenExel ACT.

Meet Our Physicians / Investigators

Dr. Peter Winkle

Peter J. Winkle, MD, FACP, CPI, FACG

Medical Director

Dr. Winkle received his medical degree at the University of Southern California. He completed his internship and residency programs in Internal Medicine at the University of California, Irvine. Then he completed a Fellowship in Gastroenterology at the University of California, Los Angeles. He is a certified principal invesitgator (CPI) and board certified in Internal Medicine and Gastroenterology. Dr. Winkle is highly skilled in all endoscopic procedures including ERCP, colonoscopy, and upper Endoscopy. He specializes in treating gastrointestinal and liver diseases, and he continues to see patients in his private practice.
Dr. Amina Haggag

Amina Haggag, MD, FAAFP, CDCES, CPI

Principal Investigator

Dr. Haggag received her medical degree at the American University of the Caribbean School of Medicine. She then completed her internship at State University of New York (SUNY) at Buffalo in Family Medicine. Dr. Haggag completed her residency at Northridge Hospital Medical Center, a University of California Los Angeles (UCLA) affiliate. She is board certified in Family Medicine, a certified principal investigator (CPI), and a certified diabetes educator.

Safety and quality are paramount

Our physicians have extensive backgrounds in their respective medical specialties and always prioritize patient safety.




150+ years of collective clinical trial experience


Assisted by expertly-trained medical staff

ACT Facility 1

Convenient Location

Some of the benefits of our Anaheim/Orange County, California location include:


There are three airports close to us, all within 30 minutes of our office: John Wayne Airport (SNA)Los Angeles Airport (LAX), and Long Beach Airport (LGB).


Only a 10 minute drive from most major hotel chains, including Anaheim Park Hotel, Marriott, Sheraton, Hilton, Doubletree, Hyatt Regency, Embassy Suites and many more


CenExel ACT

2441 W La Palma Ave
Anaheim CA 92801

Monday – Friday    7AM – 5PM

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We’re a CenExel
Center of Excellence

Centers of Excellence provide unparalleled attention to detail to assure consistent and first-class quality in patient care. We have supported tens of thousands of studies, the variety and complexity of which have resulted in a great depth of experience for the principal investigators and research staff at each Center.

We deliver engagement, expertise, and results.


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