AdFi
Harry Mamaysky

Harry Mamaysky

New York, NY
Verified Identity

Cofounder, Chief Investment Officer at

QuantStreet Capital

Member Since

2026

Allow Me to Introduce Myself

Prior to founding QuantStreet to help individuals with their investing and financial planning, I spent many years as a professional investor at Morgan Stanley, a hedge fund called Old Lane, and then Citigroup. My last job at Citigroup was running the Systemic Risk Group and reporting to the Chief Ri...

One thing I want my clients to know about me is...

At QuantStreet, we use a systematic investment process that leverages modern statistical tools, combined with experienced human oversight. We focus on asset allocation and rigorous financial planning. We typically invest in low-cost, highly diversified, liquid ETFs. We also analyze alternative investments, like private equity, which we feel are appropriate for some clients. To learn more about our approach, see our monthly investor letter at www.quantstreetcapital.com/research-analysis.

Clientele

Ultra High Net Worth Individuals
Wealthy Families
Entrepreneurs
Professional Athletes
Inheritors
Business Owners
Partners at Law Firms
Real Estate Developers

Services Provided

Specialties and Expertise

Credentials and Designations

Pricing Models

Education

Massachusetts Institute of Technology

PhD in Finance

Obtained in 2000

Brown University

MS in Computer Science

Obtained in 1994

Brown University

BS in Computer Science, BA in Economics

Obtained in 1992

Previous Work Experience

Columbia Business School

Professor

2016 - Present

Citigroup

Managing Director

2008 - 2014

Old Lane

Portfolio Manager

2006 - 2008

Morgan Stanley

Portfolio Manager

2002 - 2006

Yale School of Management

Professer

2000 - 2002

Disclosures and Proof of License

Advisor Disclosure

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AdvisorFinder Disclosure

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Profile Last Updated: October 6, 2026