Our Team

Radiant’s Clinical Provider Team

Radiant Health Centers’ provider team brings together caring professionals from our medical, behavioral health, and social services programs to support each patient as a whole person. Our medical team focuses on keeping patients healthy and managing ongoing care, including specialized HIV services. Our behavioral health team provides a safe, supportive space for mental and emotional wellness, while our social services team helps connect patients to everyday essentials like housing, food, and community resources. Together, they share a simple but powerful goal: to meet people where they are and walk alongside them on their health journey. By working as one team, they help reduce barriers, build trust, and create better, lasting outcomes for every patient we serve.

Employees & Departments

Radiant Health Centers staff are highly committed, professional and caring individuals who have served the agency for a number of years.  Many staff members are bilingual and speak fluent Spanish. To speak with a staff member, you may contact us by email or by calling (949) 809-5700

Mark Gonzales, Interim Chief Executive Officer

Danielle Nagao, Chief Financial Officer

Michael Brewer, Senior Executive Assistant

Lisa Osborn, Director of Human Resources

Robin Ferlita, Administrative and Operations Coordinator

Wendy Lords, Integrated Services and Transformation Manager

Support Services

Sandra Espinoza, Benefits Counselor

Daniel Zambrano, Eligibility Screener

Food Pantry

Brent Wellman, Food Pantry Coordinator

Olivia Hazell, Registered Dietitian

Transportation

Reyna Valle, Transportation

Volunteer Services

Annie Lee, Support Services Lead

Medical Case Management

Lupe Uribe, Nurse Case Manager

Barbara Campos, Nurse Case Manager

Christina Davezan, Nursing Supervisor

Kylie Padilla, Clinical Nurse Case Manager

Non-Medical Case Management

Edgar Alcantar, Case Manager Assistant 

Social Services Case Management

Rousana Ansari, Social Work Case Manager

Jessica Perez, Social Work Case Manager 

Social Services Non-Medical Case Management

Edgar Alcantar, Service Coordinator

Rodrigo Cohen, Service Coordinator

Melissa Perez, Client Support Services

Ricky Rodriguez, Linkage to Care

Edwin Rivera-Cortez, Chief Development Officer

Jen Moser, Director of Special Events and Corporate Relations

Su De Rego, Senior Manager of Development Operations

Michael Lara, Grants Manager and Individual Giving Specialist

Joel Rahmatulla, Director of Marketing, Communications & Public Policy

Finance

Nemmy Matiru, Controller

Anh Truong, Assistant Controller

Tammy Vu, Accounting Assistant

Joan Mwilitya, Accounting Assistant

Operations

Luis Palacios, Vice President of Healthcare Operations

Brandi Tatman, 340B Project Manager

Omar Galindo, Community Health Outreach Worker

Tanicka Stephens, Director of Housing Services

Rosa Tavarez, Senior Housing Services Case Manager

Bridgette Escobedo, Housing Case Manager

Edward Zavala, Housing Case Manager

Paul Kim, CalAIM Housing Navigator

Dr. Tulika Singh, M.D., Medical Director

Dr. Duy Nguyen, D.O., Staff Physician

Robert Fontanilla, PA-C, Physician Assistant

Thao Ho, N.P., Nurse Practitioner

L. Tom Lochner, M.D., Staff Physician

Claudio Varga, Clinic Manager

Arianna Grow, Medical Assistant

Francisco Valle, Medical Assistant

Lesley Velasco, Medical Assistant

Mireya Paz, Patient Service Representative Lead

Jessica Montes, Patient Service Representative

Edaniell Sanchez, Referral Coordinator

Omar Galindo, PrEP Navigator

Oliver De Castro, Clinical Supervisor

Christine Lezsak, MA, Patient Service Representative

Georgina J Lopez, MA, LMFT 152268, Behavioral Health Therapist

Ryan Stone, MA, LMFT 119617, Behavioral Health Counselor

John Zarate, ACSW, Behavioral Health Counselor