Our Team

Learn about the dedicated leaders behind ECS's work.

Leadership Team

Beth Stokes
Executive Director

Beth has over 20 years of experience in housing and homeless services, with her work beginning at the Coalition on Homelessness. Previously, she served as the Western Region Managing Director for the Corporation for Supportive Housing (CSH), based in Los Angeles, Director of Programs for the Los Angeles Homeless Services Authority, and Executive Director of Hamilton Families. She is currently a member of the Oakland Homeless Commission and on the Board of Directors of the Amity Foundation. Beth received her MSW in Social Welfare, Administration and Planning from San Francisco State University.

Chris Callandrillo
Chief Operating Officer

Chris has over 20 years of experience in the administration of programs and services for people experiencing homelessness, including: families and children; single adults; seniors; Transitional Aged Youth; and, those affected by HIV/AIDS. Chris worked with Catholic Charities of San Francisco for 14 years before accepting the role as Director of Programs at the Los Angeles Homeless Services Authority (LAHSA). Chris holds a BA in English from UC Berkeley, as well as an MA in Education from Stanford University.  

Eric Larra
Chief Financial Officer

Eric joined ECS in September 2014. Eric is a seasoned financial professional with over 25 years of experience including accounting and auditing, financial management and analysis, business planning and consulting. His previous employers include KPMG, Levi Strauss & Co, the Sierra Club, and Northern California Presbyterian Homes and Services.

Rick Aguilar, CPA
Senior Controller

Rick joined ECS in 2017, having worked in the real estate development and property management fields for over eight years. His experience spans both non-profit (Satellite Affordable Housing Associates) and privately held entities (Martin Building Company). Prior to these positions, he was engaged in the practice of public accounting and financial consulting services for several years in California and Texas. Rick is a licensed certified public accountant and a graduate of the McCombs School of Business at the University of Texas.

Jan-Marie Bannon
Director, Strategic Initiatives

Jan-Marie joined ECS in 2018 with more than 20 years of project management experience in both the private and non-profit sector. She has project managed the development of corporate strategic plans and worked closely with change management consultants to implement trainings and integrate improved systems and processes. Jan-Marie has spent many years volunteering with diverse communities at such organizations as La Casa de las Madres, St. Anthonys and Shanti Project. She currently volunteers with Zen Hospice. Jan-Marie holds a Bachelor of Arts in Psychology with a Minor in Sociology from San Francisco State University.

Michelle Diaz
Senior Director, Human Resources

Michelle is an accomplished HR professional with 19 years of extensive experience in all aspects of Human Resources. She joined ECS coming from the security industry, where she held similar positions of Regional Labor Relations Manager, Regional Director of Human Resources, and Divisional Director of Recruitment. 

Scott Ecker
Senior Director, Housing

Scott has been with ECS since 2001, and managed the Support Services teams at several of our housing sites before becoming the Director of Housing Services. Scott holds a BA in psychology and an MS in clinical psychology, and offers over 20 years of experience working in the community mental health and supportive housing fields. 

Michael Hersher
Director, Analytics and Impact

Michael joined ECS in August 2020 bringing evaluation and analytics expertise from across the social and private sectors. Michael’s approach to analytics is informed by his past work on emergency shelter planning and incident dispatch at the American Red Cross and industrial analytics at Kespry. He is skilled at fostering a culture of data-driven decision-making across an organization and has built analytics functions and teams within both new and established organizations. Michael holds an AB in Biochemistry from Harvard College.

David Kim
Senior Director of Asset Management

David Kim, or “DK,” has 21 years of experience in affordable housing and homeless services. David studied Social Work at San Francisco State University and began his career at the Hamilton Family Center. He transitioned into property management housing with several Bay Area affordable housing developers and into asset management with Belveron Partners.

Kevin Kitchingham
Director of Housing Development

Kevin comes to ECS with over 15 years of experience in affordable housing development. Over the course of his career, he has developed more than $750 million worth of property, and leveraged more than $500 million in outside sources. Immediately prior to joining ECS, Kevin worked with the San Francisco Mayor's Office of Housing and Community Development for a decade, most recently serving as the Senior Development Specialist. Kevin has a deep understanding of affordable housing development and a strong interest in identifying new opportunities where ECS can successfully provide critical housing support to our city's most vulnerable residents.

Ryan Lim
Director, Housing Stability & Partnerships

Ryan has over 18 years’ experience in the human services field, primarily in managing large residential treatment programs for adults with co-occurring mental health and substance use disorders. Ryan has worked in a variety of settings, from locked psychiatric wards to permanent supportive housing for people with HIV, and is a certified drug and alcohol counselor.

Tiffany Luong
Senior Director, Finance and Planning

Tiffany comes to ECS from On Lok, where she was Director of Financial Planning and Analysis for the past several years.  Previously she held a similar position at the Jewish Senior Living Group in San Francisco for over 4 years. Tiffany holds an MBA in Finance from California State Fullerton and a BS in Finance from San Diego State University

John Ouertani
Director, Facilities and Security

John Ouertani has more than two decades of experience in the human services field, much of that with managing ECS’s crisis shelters, piloting of San Francisco’s low-threshold, service-rich Navigation Centers and Adult Coordinate Entry Access Points for homeless adults’ pathways out of homelessness.

Jason Pruett
Director, Workforce Development and Social Enterprise

Jason has over 8 years of experience working in not-for-profit workforce development and food-related social enterprises in Chicago, IL. He has worked directly with the recruiting and training of agency participants, fostering relationships with prospective employers, developing/revising food-service training curriculum, promoting the organization through public speaking engagements, implementing budgeting and revenue goals for the social enterprise along with cooking and serving meals to agency participants and the public. 

Liz Tarzon
Director, Healthy Aging

Liz joined ECS in November 2018 with over 15 years of experience in working with seniors with a wide range of needs and economic backgrounds. She holds an MA in Gerontology and has enjoyed a variety of roles in areas of Case Management, Programming, Staff Training and Administration. Her work has given her great exposure in finding solutions to the difficulties seniors face including cognitive issues, affordable housing, diminishing mobility and end-of-life care. 

John Warner
Director of Adult Coordinated Entry

John started his career with ECS in 2008 as a Case Manager III in our Housing Department. He has since moved into several other positions over the years, including Support Services Manager at the Mission Navigation Center, and Senior Support Services Manager for all ECS Navigation Centers. Since 2019, John has been the Associate Director of Navigation Centers. Prior to joining ECS, John worked for Walden House and Burt Children’s Center. He holds a Bachelor of Arts in Psychology with a Minor in Communications from Curry College.