Who We Are


Rickke Mananzala, Executive Director

Rickke Mananzala (he/him/his) has been active in grassroots organizing, advocacy, and social justice philanthropy in service of racial, economic, and gender justice movements for more than two decades. He currently serves as the Executive Director of the New York Foundation, which supports community organizing and advocacy towards a more just and inclusive New York City. He previously served as Vice President of Programs at Borealis Philanthropy, a philanthropic intermediary that brings funders together to support leaders, organizations, and grassroots movements in their efforts to build power for transformative change. 

Rickke’s roots are in grassroots organizing, including serving as an organizer and eventually the Executive Director of FIERCE, a grassroots organization for LGBTQ youth of color in New York City that spearheaded campaigns to challenge youth criminalization. He was a New Voices Fellow at the Sylvia Rivera Law Project where he worked to integrate legal services, litigation, and policy advocacy to support organizing and movement-building by and for low-income transgender people in New York City. Rickke was a founding board member of the Right to the City Alliance and served on the board of the Third Wave Foundation (now Third Wave Fund) where he helped develop grantmaking strategies to support feminist youth organizing work across the U.S. He currently serves as the board chair of Funders for LGBTQ Issues. 

Rickke received his B.A. in political science from Columbia University and Master of Public Administration from Columbia University’s School of International and Public Affairs with a focus on urban policy.

Edna Iriarte, Senior Program Officer

Edna Iriarte came to the New York Foundation in 2009. As part of the program team, she evaluates grants, conducts site visits, writes recommendations for board review, and provides on-going support to community organizing and advocacy organizations. She manages the Summer Internship in Community Organizing program and represents the Foundation in the Fund for New Citizens and the New York City Youth Funders group. Edna’s philanthropic experience began with an internship in 1994 at the Norman Foundation. Later, at the New World Foundation, she played an important role in launching the Phoenix Fund for Workers and Communities and in developing an apprenticeship model for program associates. As a program officer with the Jessie Smith Noyes Foundation, she managed a portfolio of organizing groups dedicated to protect New York City’s environment and the health of its residents. In addition to her work in philanthropy, Edna conducted research informing the creation of La Fuente, a labor and community partnership that promoted immigrants’ and workers’ rights. Edna earned a master’s degree in urban planning from the Robert F. Wagner Graduate School of Public Service at New York University. She completed her bachelor’s degree in Spanish and Italian at Queens College of the City University of New York. The daughter of immigrant parents and originally from New York City’s Lower East Side, she lives with her compañero and her son in Jackson Heights, Queens.

Isabel Rivera, Senior Grants Manager

Isabel Rivera has been with the New York Foundation since 1994 and handles grants management and coordinates the foundation’s capacity building program. Mrs. Rivera served as the foundation’s program assistant prior to her current position. She is a member of the Grants Manager Network. Prior to the New York Foundation, Mrs. Rivera worked at Columbia University Medical Center’s Dermatopathology Department. Mrs. Rivera holds a bachelor’s degree in sociology from Hunter College. She lives in the Bronx with her husband and two sons.

Melissa Ellison, Senior Finance and Operations Manager

Melissa Ellison joined the New York Foundation in 2002. Mrs. Ellison manages the foundation’s finances and human resources. She provides administrative support to the program staff and acts as a liaison to the foundation’s trustees. Prior to her current position, Mrs. Ellison served as a program assistant and acting grants manager. Her other work experience includes positions as a financial assistant and education associate at St. Francis Xavier Action Youth Center. She was awarded an internship at the Municipal Credit Union by the African-American Credit Union Coalition. Mrs. Ellison holds a bachelor of science in business management and finance from CUNY Brooklyn College. She is a Certified Not-for-Profit Accounting Professional.

Zabrina Collazo, Program Officer

Zabrina Collazo joined the New York Foundation in 2020 from the Ms. Foundation for Women where they managed a portfolio of women-led, and particularly women of color-led, grantees working at the local, state, and national levels across the U.S. Before becoming a program officer, she was a program associate supporting grantmaking, grantee convenings, and capacity building. Their first foray into philanthropy was as a program assistant at the Scherman Foundation. Zabrina co-chaired the Youth Leadership Engagement Working Group at Funders for Reproductive Equity from 2016 through 2020. A lover of books, Zabrina worked at the Asian American Writers’ Workshop and Bluestockings Bookstore. She has organized in NYC’s Filipino-American community with Filipinas for Rights and Empowerment (FiRE), an organization that connected the Filipino diaspora to the women’s movement in the Philippines. Zabrina is the child of a Filipina immigrant from Batangas and a Puerto Rican from Brooklyn. They graduated from CUNY Hunter College, where she organized against budget cuts and tuition hikes and pressured the administration to provide funding and staffing for Asian American Studies. They currently live in Queens.

Maggie Colgan, Communications Manager

Maggie Colgan joined the New York Foundation in 2019 as the communications manager. Prior to the foundation, Maggie worked in children’s publishing, reading and editing for Creston Books and managing client relations for children’s publisher-clients at Publishers Group West. In college they led their school’s climate justice student group, started a surrealist writing collaborative, and coordinated on-campus writer’s residency programs for artists such as Suheir Hammad and Joe Sacco. In addition to professional communications, Maggie is an experimental electronics musician and vocal performer. Maggie received their B.A. in Transnational Literature and Creative Writing from Hampshire College.

Sena Taveras, Operations Associate

Sena (she/her/ella) joined the New York Foundation in 2022 as the Operations Associate. In her previous role as a Senior Program Associate at LIFT, a national anti-poverty organization, Sena provided programmatic and operational support to the regional team. Additionally, Sena was responsible for delivering high-quality workshops and developing community events that worked to increase parents’ social capital, economic mobility, and overall well-being. She also managed the office operations and assisted in the coordination of program and fundraising events.

Sena received a BA in Humanities and Justice from John Jay College of Criminal Justice and is pursuing an MPA from the Austin W. Marxe School of Public and International Affairs at Baruch College. Originally from the Dominican Republic, she currently lives in the Bronx.

Ruhama Mumin, Communications Assistant

Ruhama Mumin joined the New York Foundation in 2017. She worked as a digital communications intern from 2017 to 2019, then returned as the New York Foundation’s summer intern in 2020 and 2021. Ms. Mumin graduated Hunter College High School in 2019, where for two years she was editor-in-chief of The Coloring Book, and president of the Muslim Student Association for 3 years, the longest running presidency in Hunter’s history. Now, as a sophomore at Stony Brook University majoring in Psychology, Ms. Mumin has resumed her post once again and will be working with Maggie Colgan as the digital communications assistant. You can meet her in our profile interview here.

Siri Ketha, Summer Intern in Community Organizing

Siri Ketha (they/she) is a rising senior at Barnard College pursuing a B.A. in American  Studies. They use an abolitionist framework and are interested in looking at the intersections of racial, gender, economic, climate, disability, and food justice so all community members’ needs are met, and joy and kindness are centered daily. They were an organizing intern with the Riders Alliance advocating for better buses in Queens and the Bronx. They also work with the South Asian Feminism(s) Alliance and Students for Justice in Palestine at Columbia University. They grew up in Dallas, Texas where they organize with ICE Out of Tarrant County to abolish ICE, and the Live Free team to decarcerate Dallas. They love changing their hair color and playing overcooked with their friends!

Board of Trustees

Robert Cordero

Board Chair

Faiza Ali

Crilhien Francisco

Vanessa Leung

Trish Tchume

Rasmia Kirmani

Vice Chair

Lenore Champagne Beirne

Chris Harvell

Cathie Mahon

Gay Young

Kerry-Ann Edwards


John Blasco

Eric Horvath

Victor Quintana

Headshot of George Suttles

George Suttles


Holly Delany Cole

Sue Kaplan

gabriel sayegh

Previous Trustees of the New York Foundation >>