About Stephen Siderow
Professional journey
Prior to founding Siderofsky Strategic Advisors, Stephen was President and Co-Founder of BlueMountain Capital Management, an alternative investment firm he launched with Andrew Feldstein in 2003. Under their leadership, the firm grew to oversee $23 billion in assets, employed over 300 professionals, and operated offices in New York, London, and Tokyo.
Since then, Stephen has served as Senior Advisor to Crayhill Capital, a New York-based private credit investment firm focused on asset - based structured finance. Stephen advises several innovative companies, including Allposit Inc., which delivers integrated digital platforms to the wealth management sector; NewVest, a pioneer in passive index investing for private markets; and Barsys, an AI enabled cocktail making machine.
He was a Senior Consultant at McKinsey & Company, and worked with top-tier financial institutions across global hubs like New York, London, Zurich, and Tel Aviv, on their strategic growth initiatives. He later served as Senior Strategist at Millennium Management, a major multi-merger hedge fund based in New York
He began his professional journey as a corporate attorney at Cleary Gottlieb and served as a law clerk to Judge Jacob Mishler of the U.S. District Court for the Eastern District of New York.
He holds a J.D., with honors, from Harvard Law School; a B.A. in Philosophy, magna cum laude, from Amherst; and both Fulbright and Sheldon Fellowships for studies at Tel Aviv University, Israel.
Community partnerships that matter
Not-for-Profit commitments
Stephen is deeply committed to contributing beyond business. He serves on the boards of multiple nonprofit organizations:
Helping emerging leaders in law, business, public policy, and technology, experience Israel firsthand through peer-led educational treks.
The National Jewish Center for Learning and Leadership - fostering pluralistic Jewish thought leadership and innovation.
The Hertzberg Palliative Care Institute at Mount Sinai - strengthening palliative care education, research, and compassionate services for patients and families facing serious illness.
A prominent incubator, supporting emerging artists and encouraging creative expression in New York City.
He was also Vice Chair of the Birthright Israel Foundation, helping to expand educational travel opportunities for young Jewish adults to connect with their heritage and community.
From humble beginnings a lasting legacy
Siderofsky Strategic Advisors honors the legacy of Stephenʼs grandfather, Max Siderofsky - a first-generation American who rose from humble beginnings in Hartfordʼs immigrant Jewish community to become a college graduate and accountant in New York.
Rediscovered generations later, the Siderofsky name is now a living tribute to perseverance, integrity, and legacy - a reminder that every great story begins with vision and grit.
