Board of Directors

CHA is deeply grateful to our Board of Directors for their support and leadership. Our Board includes a dynamic group of individuals with experience serving as health advocates, senior citizens and/or disability community advocates, attorneys, professors, researchers, business and non-profit executives, and Health Insurance Counseling & Advocacy Program managers.

Executive Committee

Ben Winker, Chair
Clare Smith, Treasurer

Board Members

Lorenda Sanchez
John Tan


Catherina Isidro- headshot-modified

Executive Director

SMP Director

Catherina Isidro has over 20 years of  experience in the private and non-profit sectors which have given her a keen understanding of the legislative process and association management.

Training & Policy Specialist

Bonnie Burns has over thirty years of experience in Medicare, Medicare supplemental insurance, and
long-term care insurance.

Training & Education Specialist

Tatiana Fassieux is a Training Specialist for California Health Advocates (CHA) an organization dedicated to Medicare advocacy and education for Californians.

Karen Joy Fletcher, Publications Consultant

Communications & Marketing Director

Karen Joy Fletcher has over 20 years of experience in Medicare training, education and advocacy and has served with CHA since 2004.

Porsha Avila

Operations Specialist

 Porsha Avila joined CHA/SMP in 2022 and serves our state’s beneficiaries through managing our SMP helpline, doing client intakes and entering client data into the SIRS database. 

Deputy Executive Director

SMP Program Manager

Christina Dimas-Kahn was the Program Manager for San Mateo Health Insurance Counseling & Advocacy Program for 10 years before joining California Health Advocates.

Tumikia Watu-Khuthaza, Web Designer

Website Developer

Tumikia Watu-Khuthaza worked as a graphic designer for 20+ years. Her background in design led to a web design business that she has successfully run for 11+ years.


Finance Director

Marti Holland, our Finance Director, joined California Health Advocates in 2007 and has over 35 years of experience in the accounting field.

Interested in making a difference and preventing Medicare fraud?

Join our team and become an SMP Volunteer!


Contact our California Senior Medicare Patrol (SMP) at 1-855-613-7080.

We’re on a mission, serving with passion, purpose and a smile!