Denver, Colorado

Velocity Clinical Research, Denver

Velocity's Denver research site was founded in 1988 as Downtown Women’s Health Care and was acquired by Velocity in 2021. The site has a long history in women’s health research in addition to vaccines and Internal Medicine. Velocity Denver services the Denver-Aurora-Lakewood service area with a population of 2.9 million and rapidly growing. Denver’s experienced staff maintains high quality standards and enrollment on all their trials.

Located along a major roadway, the Denver site is in a high traffic shopping center. With access to a large population, the Denver team excels at meeting enrollment goals on all their studies. Ample parking is available for patients. The site is also located 2 miles from a local hospital.

All trials conducted at the site are performed in accordance with ICH and FDA guidelines, and in compliance with GCP. The Denver team is committed to being a resource for study participants, to providing the highest quality of patient care with compassion and kindness, and to advancing medicine through research.

Velocity Clinical Research, Denver
3773 Cherry Creek North Drive, Suite 685, Denver, CO 80209

Phone: (303) 293-3733


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About Velocity Clinical Research

100,000+ people have a joined a study at Velocity

Many people enjoy the study experience and have joined several clinical trials at Velocity.

Velocity has decades of research experience

With sites that were established as long ago as 1986, Velocity has experts who have supported clinical trials for decades.

Velocity studies are led by healthcare professionals

All clinical trials conducted at Velocity are overseen by the U.S. Food and Drug Administration (FDA).

Our experienced research team in Denver

Every clinical trial is overseen by a Principal Investigator – a physician who is responsible for the rights, safety and welfare of the study participants. All physicians at Velocity are board certified in their specialty area(s) and all research staff is trained in clinical research regulations, including GCP and HIPAA. Our clinical research team in Denver is dedicated to conducting quality research in a professional and caring environment.

  • Theresa O’Lonergan, PhD, MA

    Site Director
    Theresa O’Lonergan, PhD, MA has been in clinical research and research administration for 25 years. Dr. O’Lonergan earned her PhD in clinical investigations from the University of Colorado. After retiring from the CU School of Medicine, she held Research Integrity Officer positions in several large health systems and joined Velocity in 2021.

  • Kevin O’Brien, MD

    Principal Investigator
    Kevin O’Brien, MD is the Medical Director for our Velocity Denver site. He was trained in Pediatrics at The University of Texas Medical School at Houston and is board certified in the subspecialty of Allergy, Asthma and Immunology, with training at the University of Cincinnati. Dr. O’Brien also holds a Master’s degree in Nutrition. He works with both children and adults and has both clinical and research experience primarily in the areas of asthma, allergies (environmental and food allergies), immunology, vaccines, dermatology, gastroenterology, and pharmacogenomics.

Complete the form to start your clinical trial journey in Denver

Beyond helping advance medicine, you may also:

  • Get care from a local doctor at no cost
  • Learn about new medicines in development
  • Receive study-related medical exams at no cost
  • Get paid for participating (amounts differ for each study)

After you submit your info, a Velocity staff member will review your info. They will contact you to talk about the study, or others that may be right for you.

Health insurance is generally not needed to join a clinical trial.

Remember, there is never an obligation to join — we're here to help you make the best decision.

Submit your info

Sponsors and CROs

From the leading pharma companies, to the most pioneering biotech startups, Velocity supports those who are exploring new frontiers in human health. Whether you’re ready to conduct a single-site study or a complex, high-volume clinical trial, trust Velocity.

clinical research team

It all starts with people like you.

Without clinical trial participants, it would not be possible to create new medicines, treatments, and cures.