5 Shocking Ways Sam Greenberg Is Quietly Reshaping US Housing Policy And Youth Homelessness

Sam Greenberg is one of the most impactful, yet often unheralded, figures in modern social impact and policy strategy. As of December 18, 2025, he has seamlessly transitioned from a student-activist who co-founded the nation's first student-run youth homeless shelter to a Principal and New York City Office Lead at Redstone Strategy Group, advising major philanthropies and government agencies on complex social issues. His career trajectory highlights a rare blend of on-the-ground advocacy and high-level strategic policy design, making him a critical voice in the ongoing national conversations about homelessness, affordable housing, and climate action. His work today is not just about managing non-profits; it’s about designing scalable solutions to some of America's most urgent problems, from pioneering youth-specific shelters to directing large-scale housing development pipelines. Greenberg's current roles at Redstone Strategy Group and as Managing Director at The Kelsey demonstrate a deep commitment to systemic change, moving beyond immediate relief to sustainable, long-term policy and housing solutions.

The Definitive Biography and Professional Profile of Sam Greenberg

Sam Greenberg’s career is defined by a relentless focus on creating systemic change for vulnerable populations, particularly young adults experiencing homelessness. His foundational work began during his time at Harvard, which has since led to influential roles in policy and strategy consulting.

• Full Name: Samuel "Sam" Greenberg
• Education: Harvard University (Class of 2014)
• Foundational Achievement: Co-founder of Y2Y Harvard Square (2015)
• Key Organizations Co-Founded: Y2Y Network, Y2Y Harvard Square, Y2Y New Haven
• Current Primary Role 1: Principal and New York City Office Lead at Redstone Strategy Group (a social impact consulting firm)
• Current Primary Role 2: Managing Director at The Kelsey (a nonprofit focused on disability-forward, affordable housing development)
• Areas of Expertise: Homelessness and Housing Policy, Strategic Planning, Climate Activism, Funder Coordination, Program Strategy, Nonprofit Management.
• Early Career/Volunteering: Began volunteering at the Harvard Square Homeless Shelter while in high school.

The Y2Y Network Revolution: From Student Idea to National Model

The genesis of Greenberg’s national influence began with a simple yet groundbreaking idea: a student-run, youth-specific homeless shelter. While volunteering at the Harvard Square Homeless Shelter, he recognized a critical gap in services for young adults, who often fall between the cracks of traditional family and adult shelters.

Alongside co-founder Sarah Rosenkrantz, Greenberg launched Y2Y Harvard Square in December 2015. This initiative was revolutionary for several reasons:

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• Student-Run Model: Y2Y (Youth-to-Youth) is staffed primarily by students, fostering a unique peer-support environment and lowering operational costs.
• Youth Focus: It is specifically designed for young adults, offering a safe space and resources tailored to their developmental needs, including educational and employment assistance.
• Scalability: The success of the initial shelter led to the creation of the Y2Y Network, an organization dedicated to replicating the model. This expansion included the establishment of Y2Y New Haven, a multi-million dollar project to transform a Grand Avenue building into a new youth shelter.

The Y2Y model has established a new standard for addressing youth homelessness, emphasizing dignity, empowerment, and a pathway out of poverty, solidifying Greenberg’s reputation as a visionary in direct service and systemic advocacy. His thesis at Harvard, titled "Through No Fault of Their Own," directly informed this work by examining how responses to homelessness are framed by the concept of the 'deserving and undeserving poor.'

Greenberg’s Strategic Shift: Directing Policy and Housing Development

The transition from running a direct service organization to leading high-level strategy at firms like Redstone Strategy Group and The Kelsey is a testament to Greenberg’s desire to influence policy at a broader scale. His current roles are focused on creating the infrastructure for large-scale, sustainable social change.

1. Leading Social Impact Strategy at Redstone

As a Principal and the New York City Office Lead at Redstone Strategy Group, Sam Greenberg is responsible for designing program strategies for major philanthropies, government agencies, and large funder collaborations. This work involves tackling urgent social problems by providing strategic planning and policy development expertise.

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A notable area of his work at Redstone involves climate activism and policy. He has co-authored reports demonstrating how local, community-based climate activism can lead to "remarkable" and meaningful impacts, illustrating the good return on investment in grassroots efforts. This dual focus on social equity (homelessness) and environmental sustainability (climate policy) positions him at the intersection of two critical modern challenges.

2. Driving Affordable Housing at The Kelsey

Greenberg’s commitment to housing is currently demonstrated through his role as Managing Director at The Kelsey. This nonprofit is pioneering the development of disability-forward, affordable housing communities. In this capacity, he leads the organization's housing development pipeline, manages key partnerships, and directs overall strategy. This work directly addresses the root cause of homelessness by increasing the supply of inclusive, affordable housing units, leveraging his deep knowledge of housing policy and community needs.

3. Policy and Advocacy Entities

Through his various roles, Greenberg has engaged with and influenced a wide array of entities and policy discussions, including:

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• Housing Policy and Advocacy: Developing strategies for increasing the supply of affordable and supportive housing.
• Funder Coordination: Bringing together major philanthropic foundations to align their efforts for greater collective impact.
• Government Agencies: Partnering with local and state governments to implement effective, evidence-based social programs.
• Framework of the Deserving and Undeserving Poor: Challenging outdated societal views on who deserves assistance, a core theme of his early research and advocacy.

Sam Greenberg's career is a blueprint for effective social entrepreneurship, demonstrating that success requires both compassionate direct service and sophisticated, high-level policy strategy. His leadership in the Y2Y Network, Redstone Strategy Group, and The Kelsey ensures his influence on youth homelessness, affordable housing, and social policy will continue to grow throughout 2025 and beyond.

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