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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 Citigroup, Morgan Stanley, and a hedge fund called Old Lane. I'm also a Professor of Professional Practice at Columbia Business School, where I teach about ...

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

At QuantStreet, we use a quantitative investment process that leverages machine learning and AI combined with experienced human oversight. We focus on asset allocation and typically invest in low-cost, highly diversified ETFs. Our portfolios avoid short-selling, excessive leverage, and other strategies that are often unsuitable for individual investors. To learn about my approach to investing, you can read QuantStreet's 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

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

Disclosures and Proof of License

SEC Profile
FINRA BrokerCheck

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Profile Last Updated: October 2, 2026