Who We Are

Senior Management Team

MARIO J. CALLA

Executive Director

Mario J. Calla, BA, MSW, has been the Executive Director of COSTI Immigrant Services since 1987. Read More

JOSIE DI ZIO

Senior Director of Planning and Program Development

Josie Di Zio has over thirty years’ experience in Senior Management of agencies serving newcomers. Read More

ROBERT CAZZOLA

Director Education and Information Technology

Robert Cazzola has a Master of Social Work degree from the University of Toronto, and has been a Director at COSTI since 1984. Prior to his current position, Robert was the Director of Social Services for COSTI. Read More

YASMINE DOSSAL

Director Social Services

Yasmine joined COSTI in her present position in 2002. Read More

JULIE DARBOH

Director, Employment Services

Julie has a Master of Social Work degree from the University of Toronto with an area of interest in Policy, Communities & Organizations. Read More

RENA ZHOU

Director, Finance

Rena Zhou graduated with a Bachelor of Science degree in Engineering, with a major in Electronic Engineering from Beijing, China. Read More