Behind every study are people. Sayo is made up of a founding team that runs the operation and investigators with verifiable experience in their fields.
Founders
KV
Karen Villegas
Co-Founder & Lead Clinical Research Coordinator
Karen leads Sayo's clinical coordination and the contact with those who take part in studies: the operational heart of every protocol at the site. A Chemist, Bacteriologist and Parasitologist (QBP) with additional training in hematology and pharmacy, she holds current Good Clinical Practice (GCP) certification. She brings verifiable experience as a clinical research coordinator on Phase III and Phase IV trials across oncology, immune-inflammatory, infectious, and metabolic conditions, in coordination, pharmacy, and sample-collection roles.
DG
David Gallegos
Co-Founder & Operations Manager
David leads Sayo's operations and sponsor relationships. He brings over a decade of international experience, across Europe and the United States, within strict regulatory and documentation frameworks —including data protection under standards such as Europe's GDPR— now applied to GCP and COFEPRIS. He works fluently in both Spanish and English and holds current GCP certification.
Associated investigators
Oncology
MO
Associated investigator · Medical oncology
A medical oncologist certified by the Mexican Council of Oncology, with extensive experience in oncology clinical research as Principal Investigator and Sub-Investigator. Current GCP certification. Full professional profile available on request at admin@sayoclinics.com.
Immune-inflammatory conditions
ZF
Dr. Zabdy Frayre
Associated investigator · Dermatology
Anchors Sayo's immune-inflammatory diseases area with her specialty in dermatology. A physician (Médico Cirujano) specialized in Dermatology, with additional training in hair and nail disorders, clinical dermatology, and aesthetic dermatology. She brings experience as a sub-investigator on Phase III clinical trials. Current GCP certification.
RV
Dr. Ricardo Venegas Yáñez
Associated investigator · Rheumatology and Internal Medicine
A rheumatologist trained at the Instituto Nacional de Cardiología “Ignacio Chávez” in Mexico City, after specializing in Internal Medicine at the Hospital Central Universitario in Chihuahua. He holds current Good Clinical Practice (GCP) certification and has served as Principal Investigator and Sub-Investigator in Phase III rheumatology clinical trials.
Infectious diseases
DR
Dr. David Rodríguez Luna
Associated investigator · Infectious Diseases and Internal Medicine
A board-certified internist and infectious disease specialist, trained at the Hospital Central Universitario del Estado de Chihuahua and at the Antiguo Hospital Civil de Guadalajara “Fray Antonio Alcalde,” where he served as Chief Resident in both specialties. His practice centers on the management of complex infections, antimicrobial resistance, and antimicrobial stewardship programs, with an evidence-based approach and active clinical teaching. Current GCP certification.
Support network
The team is complemented by external consultants in monitoring, regulatory affairs, and quality, and by medical and nursing support, who reinforce the operation as each study requires.
Collaborate with Sayo
Are you an investigator interested in collaborating?
We bring on investigators for the quality of their profile and for a lasting professional relationship, not to cover a one-off protocol. If you'd like to explore working with Sayo, let us talk.
