Experience, Longevity, Quality and Service.

CenExel Centers of Excellence offer world-class quality and experience. CenExel HRI champions that standard.

CenExel HRI provides cutting-edge treatment while advancing medical research.

With two large campuses in Berlin, New Jersey, and Marlton, New Jersey (both just 20 minutes from Philadelphia), CenExel HRI, formerly Hassman Research Institute, is a leading clinical research organization that conducts studies in a wide variety of therapeutic areas. CenExel HRI’s highly trained and experienced staff, including four board certified clinical investigators, is dedicated to maintaining the highest standard of quality results in the trials they conduct.

Hundreds of clinical trials conducted since 2010.
View Current Studies
CenExel HRI offers 27,000 square feet of facility space with several dedicated units.
CenExel HRI exceeds 100% of patient target in recruitment.
Full-service, Phase I CRO capabilities provided through strategic partnerships.
CenExel HRI centralizes budgeting and contracting for faster study start-up.
group of people
CenExel HRI serves a broad and diverse demographic.

Center Leadership

Debra Hoffmeyer

Howard Hassman, D.O., AOBFP

Chief Scientific Officer and Principal Investigator

Dr. Hassman has over 37 years of experience in clinical research. His strategic vision and commitment to the highest standard of quality has helped establish HRI as a leading clinical research organization since its founding in 2015. The growth of HRI is highlighted by the opening of the Marlton location, where Dr. Hassman currently conducts trials, 2019.

With decades of experience as an investigator and an extensive background in psychopharmacology, pain management, and addiction medicine, Dr. Hassman provides scientific leadership and operational expertise to ensure the success of each trial. He also provides a broad range of expert consulting services to clients for early drug development, developing creative, de-risked solutions for a variety of clinical programs.

David Poling

Larry Brownstein, MBA

Chief Operating Officer

Larry joined HRI with decades of experience in the healthcare and pharmaceutical industry and a demonstrated ability to build businesses, accelerate growth, and operationalize strategic goals. He works with the leadership team to set company performance goals and develops and implements strategies to achieve them. He works collaboratively across functions, levels, and departments to improve systems, processes, and controls that enhance the overall efficiency of HRI and ensure excellent client service. Larry fosters a success-oriented, accountable environment within the company, coaching and developing the team to ensure they are delivering against key business metrics.

2018 – 2020 Statistics

Therapeutic Areas

Clinical Trials

Patients Enrolled



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Reaching new heights in clinical research

Our Centers of Excellence provide unparalleled medical and scientific support in the design and execution of clinical trials. Our attention to detail assures quality, reliable results, and has helped CenExel to consistently achieve and exceed patient recruitment goals. We deliver the expertise, engagement, and results to ensure our clients achieve their clinical research goals.

To speed up study implementation, we provide centralized budgeting and contracting for sponsors engaging multiple Centers of Excellence. The geographic diversity of our network offers strong access to roughly 35 million subjects while our broad therapeutic expertise enables a variety of clinical trial strengths.

Top Therapeutic Areas of Expertise

Alzheimer’s Disease
Anxiety Disorder
Bipolar Disorder
Depressive Disorders
Parkinson’s Disease

Seasonal Influenza
Pandemic Influenza

Acute Post-op Pain:
Open Hernia Repair
Wisdom Tooth Extraction

Healthy Volunteer (all ages)
Sleep Apnea
Women’s Health

Meet our Centers of Excellence

Click on any highlighted state to see our Centers of Excellence

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