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Jonathan A. Karen

Partner, Simpson Thacher & Bartlett

New York, NY

Jonathan A. Karen is a partner at Simpson Thacher & Bartlett in New York, working on fund formation, private equity funds and real estate funds; in practice since 2001.

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Last verified Oct 24, 2026 against stblaw.com. How we check

Overview

Office
New York, NY
Experience
In practice since 2001 · 25 years
Main practice
Fund formation
Represents
GPs and Sponsors

Appears in: Where Private Fund Lawyers Went to Law School, a FundOpsHQ guide that names everyone it counts.

Source: stblaw.com, as of Oct 24, 2026. View the bio

Practice

  • Fund formationthe practice the bio leads with

    From the bio
    “Jonathan has led the Firm's recent efforts in some of the industry's most successful and market-defining private equity fund formations”

  • Private equity funds

    From the bio
    “Jonathan has led the Firm's recent efforts in some of the industry's most successful and market-defining private equity fund formations”

  • Real estate funds

    From the bio
    “Blackstone Real Estate Partners X ($30.4 billion, 2023), Blackstone Real Estate Partners IX ($20.5 billion, 2019)”

  • Infrastructure funds

    From the bio
    “Stonepeak Infrastructure Fund IV ($14 billion, 2022)”
1 more practice

  • Secondaries

    From the bio
    “across multiple asset classes, including buyout, real estate, infrastructure, secondaries and distressed and mezzanine debt”

Read from the practice description in the bio on stblaw.com, as of Oct 24, 2026.

Experience

In practice since 2001 · 25 years

Based on: J.D., New York University School of Law, 2001.

Years and earlier employers as stated in the bio on stblaw.com, as of Oct 24, 2026.

Education and admissions

Education
  • New York University School of Law, J.D. (2001)
  • Duke University, B.A. (1998)
Bar admissions

As the bio lists them. We do not check whether a licence is current; each state’s own lookup does.

As listed in the bio on stblaw.com, as of Oct 24, 2026.

Colleagues at Simpson Thacher & Bartlett

All 58

Fund Lawyers in New York at other firms

All 844

Partners with practices in common with Jonathan, most in common first.

  • Andrew M. Ahern

    Davis Polk & WardwellPractices in common: fund formation, private equity funds

  • Sara Allawi

    Weil, Gotshal & MangesPractices in common: fund formation, private equity funds

  • Jason Behrens

    LinklatersPractices in common: fund formation, private equity funds

  • Robert Blaustein

    Kirkland & EllisPractices in common: fund formation, private equity funds

  • Michael Bolotin

    Debevoise & PlimptonPractices in common: fund formation, private equity funds

  • Gerald H. Brown, Jr.

    DechertPractices in common: fund formation, private equity funds

Questions about Jonathan A. Karen

What does Jonathan A. Karen work on?

Simpson Thacher & Bartlett’s bio of Jonathan A. Karen leads with fund formation, and also lists private equity funds, real estate funds, infrastructure funds and secondaries. It says Jonathan A. Karen acts for sponsors (GPs).

Where is Jonathan A. Karen based?

In Simpson Thacher & Bartlett’s New York office.

How long has Jonathan A. Karen practised?

Since 2001, 25 years, going by the bio (J.D., New York University School of Law, 2001).

Where did Jonathan A. Karen study?

New York University School of Law and Duke University.

Where is Jonathan A. Karen admitted to practise?

The bio lists New York.

How can I contact Jonathan A. Karen?

Through the bio page on stblaw.com. FundOpsHQ does not publish email addresses or phone numbers.