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Shannon M. O'Sullivan

Partner, Simpson Thacher & Bartlett

New York, NY

Shannon M. O'Sullivan is a partner at Simpson Thacher & Bartlett in New York, working on fund formation, private equity funds and private credit funds; in practice since 2005.

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

Overview

Office
New York, NY
Experience
In practice since 2005 · 21 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
    “Shannon O'Sullivan concentrates on the formation and operation of a diverse platform of private funds”

  • Private equity funds

    From the bio
    “Shannon focuses on the organization, structuring and operation of a wide range of private funds, including real estate funds; buyout funds”

  • Private credit funds

    From the bio
    “distressed debt/credit, mezzanine and senior loan funds; energy/infrastructure funds; and hedge funds”

  • Real estate funds

    From the bio
    “Shannon O'Sullivan concentrates on the formation and operation of a diverse platform of private funds, including real estate funds”
2 more practices

  • Infrastructure funds

    From the bio
    “energy/infrastructure funds; and hedge funds, among other alternative arrangements”

  • Hedge funds

    From the bio
    “energy/infrastructure funds; and hedge funds. She also counsels sponsors”

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

Experience

In practice since 2005 · 21 years

Based on: J.D., George Washington University Law School, 2005.

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

Education and admissions

Education
  • George Washington University Law School, J.D. (2005)
  • University of Michigan, B.A. (2002)
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 Shannon, most in common first.

  • Jason Behrens

    LinklatersPractices in common: fund formation, private equity funds

  • Erica Berthou

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

  • Robert Blaustein

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

  • Yehuda Braunstein

    Sadis & GoldbergPractices in common: fund formation, private equity funds

  • Heather Cruz

    SkaddenPractices in common: fund formation, private equity funds

  • Christopher J. Dlutowski

    Morgan, Lewis & BockiusPractices in common: fund formation, private equity funds

Questions about Shannon M. O'Sullivan

What does Shannon M. O'Sullivan work on?

Simpson Thacher & Bartlett’s bio of Shannon M. O'Sullivan leads with fund formation, and also lists private equity funds, private credit funds, real estate funds, infrastructure funds and hedge funds. It says Shannon M. O'Sullivan acts for sponsors (GPs).

Where is Shannon M. O'Sullivan based?

In Simpson Thacher & Bartlett’s New York office.

How long has Shannon M. O'Sullivan practised?

Since 2005, 21 years, going by the bio (J.D., George Washington University Law School, 2005).

Where did Shannon M. O'Sullivan study?

George Washington University Law School and University of Michigan.

Where is Shannon M. O'Sullivan admitted to practise?

The bio lists New York.

How can I contact Shannon M. O'Sullivan?

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