• Registered Investment Advisers
    Walnut Investment Services
    Because it's Your Money.
    Your Investments. Your Life.
  • Because it's Your Money. Your Investments. Your Life.
    Independent, Unbiased
    Financial & Investment Advise
  • For Individuals, Families and Small Businesses
    Providing the highest level of personal financial & investment advice

With tax season in full swing, it's time to review your investments and retirement plans

All about us!

About Walnut Investments

Who we are

Walnut Investment Services LLC. is an independent, registered investment adviser. Established in 2000 and based in Park Slope, Brooklyn, we specialize in providing the highest level of personal financial & investment advice to individuals, families and small businesses. Our team offers over 50 years years of combined experience, matched with the focused attention and personal service of an independent, locally-owned company. Providing solutions for the financial success of each and everyone of our clients is of paramount importance to us. Walnut Investment Services LLC was founded on the premise that the best financial advice should be independent, unbiased and customized for each client's needs.

Mark Blinderman (Registered Investment Advisor, Managing Partner)

Mark was born in 1963. Graduate of Bernard M. Baruch College, he holds a Bachelor’s degree in International Economics. He is a Registered Investment Adviser, Certified Estate Adviser and a Notary Public.

Harvey Kraus (Registered Investment Advisor, Managing Partner)

Harvey was born in 1951, graduated from Brooklyn College in 1975 with a Bachelor’s degree in accounting and for the past 35 years has been running his own accounting practice. He is a Registered Investment Adviser and an Enrolled Agent with the IRS.

Let us help you

Our Services


Walnut Team

Mark Blinderman

Managing Partner
RIA, CEA, Notary Public

Mark Blinderman

Financial Planning/Investments

Harvey Kraus

Managing Partner
RIA, Accountant, Enrolled Agent

Harvey Kraus

Tax Advice & Investments

News, tips & more!

In the Press

Bond Bubble
  • April 1, 2012

Bond Bubble to Burst?

For the past two years, Mark Blinderman, who works as an IAR for a registered investment advisory in Brooklyn, N.Y., has been shifting away from municipal bonds and Treasuries towards dividend-paying equities and inflation-protective bonds (TIPS). He believes we are in the midst of a bond bubble that will inevitably burst.

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Walnut Investments - New York 5-star Wealth Managers
  • January, 2016

New York Magazine

Walnut Investment Services, LLC made the list of New York's Five Star Wealth Managers - highest in service and overall satisfaction.

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Mark Blinderman in The Wall Street Journal
  • Feb 22, 2016

In the news: this week’s top money stories

"An increase in regulation over the past 10 years, especially after the Dodd-Frank bill passed in 2008, has made it increasingly difficult to keep our business small."...

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Mark Blinderman in The Wall Street Journal
  • Jul 20, 2017

Overwhelming investment options require strategic guidance

"Investors can, at least in theory, purchase stock from any of the more than 100,000 publicly traded companies in the world. "...

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Mark Blinderman Rings Opening Bell on Wall Street
  • Jul 31, 2018

Memorable day for Walnut Investment Services

Mark Blinderman was invited to participate in the ringing of the opening bell at the New York Stock Exchange on July 31, 2018.

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