George Ayala

George Ayala, PsyD
Executive Director |

Dr. Ayala has worked in the non-profit HIV/AIDS sector managing multi-million dollar budgets and supervising large, interdisciplinary teams of professionals for over 20 years. A clinical psychologist by training, Dr. Ayala has conducted HIV social science and intervention research since 1996. His research has mainly focused on understanding the mechanisms through which social discrimination affects the risk for HIV among gay men of color in the U.S.

Nadia Rafif

Nadia Rafif
Director of Policy |

Nadia comes to the MPact from her post as Executive Director of Association de Lutte Contre le Sida (ALCS) in Marrakech, Morocco, where she led the development of numerous regional projects across the Middle East and North Africa. Nadia will work with MPact constituents, staff, and leadership to advance MSM health and human rights through high-level advocacy, strategic policy analysis, and capacity building for grassroots advocates and organizations working with MSM.

Mohan Sundararaj

Mohan Sundararaj, MBBS, MPH
Director of Public Health Programs |

A trained physician with a master’s degree in Public Health, Mohan is responsible for providing technical input to local public health programs targeting marginalized communities and developing responses to in-country capacity needs. He transitioned into this role from the MPact policy team where he advanced policy initiatives and provided support to the MPact Transgender Reference Group.

Sonya Arreola

Sonya Arreola, PhD MPH
Sr. Research and Programs Advisor |

Dr. Arreola has extensive experience leading community based participatory research projects (CBPR); disseminating results across multiple mediums and audiences; and using findings to advocate for the needs of marginalized communities. Currently, Dr. Arreola’s research at MPact focuses on uncovering the individual, environmental and social determinants of sexual health among gay men and other men who have sex with men.

Omar Baños

Omar Baños
Senior Technical Advisor |

Omar Baños has worked in HIV prevention, treatment education, policy, and capacity development in Latin America for more than 12 years. As the Policy Initiatives Field Manager, Omar works to develop, plan, and implement capacity building trainings and advocacy campaigns, as well as represent the MPact consistently and appropriately with international and regional networks worldwide.

Lily May Catanes

Lily May Catanes, MBA
Director of Operations & Finance |

With foundations in international business, leadership, and marketing, Lily brings experience ranging from event, project, and office management to bookkeeping and instructional design for online education and training. In her 6th year at the MPact, she monitors administrative, financial, and reporting requirements outlined by funders.

Pato Hebert

Pato Hebert, MFA
Sr. Education Advisor |

Pato Hebert has been working in HIV prevention since 1994. His work has focused on community mobilization, cultural production, harm reduction, HIV prevention programming, and information messaging. He works to provide connective tissue across multiple projects of MPact, including research and policy efforts.

Pato Hebert

Sherrie Hicks
Sr. Accountant |

Sherrie brings twelve years of non-profit accounting experience supporting domestic and international locations.  Sherrie’s IT accounting work has included implementation of Electronic Health Records of Dental Clinic records and accounting software conversion and customized Crystal Reports.  She also worked in the private sector for a CPA and accounting companies.  Sherrie has an accounting degree from Rose State University and an active member of National Association of Black Accountants and California CPA Associations. At MPact, Sherrie plays a vital role in budgeting, financial reporting, cost and productivity analysis, and in the preparation of MSMGF’s regular financial statements.

Johnny Tohme

Stephen Leonelli, MPP
Sr. Policy Advisor |

Stephen Leonelli is a human rights policy analyst and community organizer. Since 2005, Stephen has participated in various anti-violence, LGBTI rights, and HIV justice movements in the USA and China. He also has experience in regional-level analyses of LGBTI rights and program design with ILGA-Europe and UNDP’s Being LGBTI in Asia initiative. At MPact, Stephen focuses on the inclusion of key populations within the 2030 Agenda framework and human rights mechanisms. He holds a master in public policy degree and is fluent in Mandarin Chinese.

Johnasies McGraw

Johnasies McGraw
Operations & Board Coordinator |

Johnasies has worked in the nonprofit sector for over a decade primarily in area of neighborhood and community development.  He’s held a variety of operations and program coordination roles while working at the grassroots level with community based groups.  He will provide support to the MPact Operations staff, Board of Directors, and steering committee members as the Operations and Board Coordinator.

Johnny Tohme

Greg Tartaglione
Sr. Communications Officer |

At MPact, Greg works to implement the organization’s strategic vision and unique voice in the ever-shifting landscape of sexual health and human rights. Greg brings his experience from Out & Equal Workplace Advocates and SIECUS as a social marketer, graphic designer, and brand ambassador to advocate for sexual health around the world.

Johnny Tohme

Johnny Tohme
MS, Community Mobilization Manager |

Johnny comes to MPact from directing M-Coalition (the first network of MSM & HIV activists in the MENA region) in Beirut, Lebanon. Started as an LGBT rights activist, he’s a clinical psychology graduate who worked in sexual health service delivery, community behavioral research and community organizing. As part of the policy department, Johnny will be working on the consortium of MSM and Transgender networks, the youth reference group of MPact and will be involved with the programs departments.


Contracts & Grants Manager |

Zamora brings years of fundraising and administrative experience, including her work as a cultural events producer working through coalitions among communities of color and LGBT and feminist organizations. As a professor of Ethnic Studies, her classes include Chicana feminist analysis and an emphasis on understanding how gender, sexuality, class, language and nation have historically been used as tools in oppression. Zamora has lead several Native American drums and sees her work as a ceremonial singer and song teacher as an important form of community healing.