Arc of Westchester Executive and Leadership Team

June, 2026

Leadership Overview

Arc of Westchester has 5 executives leading key functions including strategy, finance, and board governance.

Dedicated to empowering individuals with intellectual and developmental disabilities, Arc of Westchester drives community inclusion and provides essential support services, fostering independence and enhancing quality of life across New York.

Leadership Roles at Arc of Westchester

  • Chief Executive Officer - Tibi Guzman
  • Executive Director, Chief Executive Officer - Tibisay Guzman
  • Chief Financial Officer - Soosan Tehrani
  • President & Board of Directors - Bernard Krooks
  • President - Steven Masket
  • Tibi Guzman - Chief Executive Officer

    Tibi Guzman, the Chief Executive Officer at Arc of Westchester, directs the organization's strategic vision and operational execution. This leadership role involves guiding all facets of the non-profit's mission to support children, teens, and adults with intellectual and developmental disabilities. Overseeing program development and service delivery, Tibi Guzman ensures alignment with community needs and organizational goals. The Chief Executive Officer fosters key relationships with stakeholders, government agencies, and community partners to advance the organization's impact. This position is central to driving innovation in support services and ensuring the long-term sustainability and growth of Arc of Westchester's vital programs across Hawthorne and the wider New York region. The Chief Executive Officer's oversight extends to resource allocation and strategic planning, ensuring efficient and effective service provision.

    Tibisay Guzman - Executive Director, Chief Executive Officer

    Tibisay Guzman, the Executive Director, Chief Executive Officer at Arc of Westchester, spearheads the comprehensive strategic direction and daily operations of the organization. This dual role encompasses both high-level executive leadership and direct management of the non-profit's extensive service network for individuals with intellectual and developmental disabilities. Tibisay Guzman champions the organization's commitment to fostering independence and enhancing the quality of life for its constituents throughout New York. The Executive Director, Chief Executive Officer cultivates essential partnerships with community leaders, funding bodies, and advocacy groups to expand the reach and effectiveness of Arc of Westchester's initiatives. This leadership position is critical for navigating the evolving landscape of disability services and ensuring robust program delivery.

    Soosan Tehrani - Chief Financial Officer

    Soosan Tehrani, the Chief Financial Officer at Arc of Westchester, manages the organization's complete financial strategy and oversight. This critical role involves directing all fiscal operations, including budgeting, financial planning, and resource allocation to support the non-profit's mission. The Chief Financial Officer ensures the fiscal health and sustainability of Arc of Westchester, safeguarding assets and optimizing financial performance. Soosan Tehrani oversees accounting, financial reporting, and compliance with all relevant regulations, providing essential financial insights to guide strategic decision-making. This leadership position is integral to maintaining the integrity of financial operations and supporting the expansion of services for individuals with intellectual and developmental disabilities across New York.

    Bernard Krooks - President & Board of Directors

    Bernard Krooks, the President & Board of Directors at Arc of Westchester, provides pivotal leadership and governance to the organization. This role involves guiding the strategic direction of the non-profit and ensuring its adherence to its core mission of supporting individuals with intellectual and developmental disabilities. Bernard Krooks presides over board meetings, fostering collaborative decision-making and overseeing the effective functioning of the board's committees. The President & Board of Directors plays a key part in championing the organization's vision and advocating for its constituents within the broader community and governmental spheres. This leadership position is essential for maintaining strong organizational governance and advancing the long-term objectives of Arc of Westchester.

    Steven Masket - President

    Steven Masket, the President at Arc of Westchester, directs the organization's overarching strategic initiatives and operational frameworks. This leadership position is fundamental to guiding the non-profit's mission of empowering children, teens, and adults with intellectual and developmental disabilities. Steven Masket collaborates closely with the Board of Directors and executive team to ensure robust program delivery and fiscal responsibility across all operations. The President oversees key strategic planning processes, driving innovation and enhancing the quality of services provided throughout New York. This role is crucial for fostering community partnerships and advocating for the needs of the individuals served by Arc of Westchester, ensuring sustained growth and impact.
    Steven Masket

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    Frequently Asked Questions Regarding Arc of Westchester Top Executives and Leadership Team

    Who leads Arc of Westchester?
    Arc of Westchester is led by Tibi Guzman (Chief Executive Officer), along with executives such as Tibisay Guzman (Executive Director, Chief Executive Officer) and Soosan Tehrani (Chief Financial Officer).
    Who is part of Arc of Westchester’s executive team?
    The executive team of Arc of Westchester includes leaders such as Tibi Guzman (Chief Executive Officer), Tibisay Guzman (Executive Director, Chief Executive Officer), Soosan Tehrani (Chief Financial Officer) and other senior executives.
    How many executives does Arc of Westchester have?
    Arc of Westchester has 5 executives leading key business areas.
    What roles are included in Arc of Westchester’s leadership team?
    The leadership team of Arc of Westchester includes roles such as Chief Executive Officer, Executive Director, Chief Executive Officer, Chief Financial Officer, President & Board of Directors, President.