Site Contacts

Marjorie Guzman, BHS – CEO

Marjorie established TOPAZ Clinical Research in 2016 after acquiring over 20 years of experience in clinical research at the Site level, University level, and Sponsor level.

Marjorie has experience as a Study Coordinator, Certified Rater, Regulatory Analyst, and over 16 years as a Clinical Research Associate (CRA) in various therapeutic areas.  She knows the finest details required to efficiently oversee a successful Research Site, that is evident to sponsors that continually return to TOPAZ Clinical Research to fulfill their study needs.




Karla Francisco, BA – Director of Operations/Business Development

Karla has years of experience in administrative and managerial positions successfully leading large teams in daily operations and projects. Karla has 7 years of experience in clinical research in various administrative positions, and her expertise at TOPAZ Clinical Research includes, but are not limited to, managing operations,  project management, contracts and budgets, and business development. At TOPAZ Clinical Research, Karla is the go to person for all daily operations.


At TOPAZ Clinical Research, our team includes study Coordinators, Certified Raters, Regulatory Specialists, Business Development Department, Patient Recruitment Coordinators, and Investigators with various specialties. Everyone is GCP Certified, and selected individuals are also IATA Certified. TOPAZ Clinical Research provides unsurpassed education/certifications for all employees.

BLS, ACLS, PALS, GCP, IATA certified staff. 

Bilingual staff- English/ Spanish.

If you are a Sponsor, please contact


Contact Us

TOPAZ Clinical Research 
2513 E. Semoran Blvd. 
Apopka, FL 32703

Phone: 407-703-4342
Fax: 321-256-5416


       TOPAZ Clinical Research has an experienced and talented team with investigators with various specialties.

  • Pediatrician Principal Investigator for all pediatric studies at TOPAZ Clinical Research. Our PI has a large range of research experience working with newborns to young adults, and is the primary care physician for TOPAZ Pediatrics opening September 2020.


  • Family Practice Principal Investigator has a private practice and clinical research experience in  20+ trials in various therapeutic areas including dermatological studies, Cardiac studies, CNS studies, Mood disorder studies, and Psychiatric studies.

       Emergency Medicine Principal Investigator has over six years in Clinical Research, and has completed over 60+ studies of 

       Alzheimer’s  disease, Parkinson’s disease, Depression, Anxiety, Diabetes, and other therapeutic areas.

       Dental Surgery Principal Investigator is well known in our area and has a large practice with availability to the most modern

       devices; right  next door to TOPAZ Clinical Research.

       Sub- Investigators- Family Nurse Practitioners with years of experience in all phases of research. In addition, we have an

       extensive  database of experienced Medical Physicians with a broad range of specialties that can fill the need of any

       therapeutic area.