# Peter A. Leidel
Peter A. Leidel is a private equity investor who co-founded Yorktown Partners LLC (also known as [Yorktown Energy Partners](https://www.edgepedia.org/yorktown-energy-partners)), a New York firm that manages private equity partnerships investing in the energy industry, and serves as one of its founding partners focused on investments.[1](https://www.whitehousehistory.org/national-council/peter-leidel) • [2](https://www.privateequityinternational.com/institution-profiles/yorktown-partners.html) A 2025 SEC filing exhibit names him a Managing Member of Yorktown Partners LLC, at the firm's 410 [Park Avenue](https://www.edgepedia.org/park-avenue) address in Manhattan.[3](https://www.sec.gov/Archives/edgar/data/1577919/000114036125043354/ef20059723_ex99-1.htm) His stated investment focus is oil and gas exploration and production companies.[1](https://www.whitehousehistory.org/national-council/peter-leidel)
## Key facts
| Item | Detail |
|---|---|
| Role | Founding Partner; Managing Member, Yorktown Partners LLC, New York[2](https://www.privateequityinternational.com/institution-profiles/yorktown-partners.html) • [3](https://www.sec.gov/Archives/edgar/data/1577919/000114036125043354/ef20059723_ex99-1.htm) |
| Firm | Yorktown Partners LLC (Yorktown Energy Partners), founded 1997, energy-focused private equity[2](https://www.privateequityinternational.com/institution-profiles/yorktown-partners.html) |
| Prior career | Partner, venture capital group, Dillon, Read & Co. Inc. (1983–97); Mobil Corporation treasury (1980–83); KPMG Peat Marwick; U.S. Patent and Trademark Office[1](https://www.whitehousehistory.org/national-council/peter-leidel) |
| Education | B.B.A. with Honors, University of Wisconsin; M.B.A., Wharton School; CPA, 1980[1](https://www.whitehousehistory.org/national-council/peter-leidel) |
| Stated firm capital | $4 billion under management per Leidel's own biographical listing (unverified)[1](https://www.whitehousehistory.org/national-council/peter-leidel) |
## Yorktown Energy Partners and Leidel's role
Yorktown Partners was founded in 1997 as a New York-based private equity firm specializing in energy-focused investments across the United States.[2](https://www.privateequityinternational.com/institution-profiles/yorktown-partners.html) The firm's origin lies in a set of energy partnerships previously managed by the investment bank Dillon, Read & Co. Inc., where Leidel had been a Partner in the venture capital group from 1983 to 1997.[1](https://www.whitehousehistory.org/national-council/peter-leidel) Effective September 2, 1997, Dillon, Read & Co. Inc., which served as a manager of the Yorktown partnerships, merged with and into SBC Warburg, Inc., a subsidiary of [Swiss Bank Corporation](https://www.edgepedia.org/swiss-bank-corporation); the partnerships continued independently.[4](https://www.sec.gov/Archives/edgar/data/755199/000095016297000931/0000950162-97-000931.txt)
Strategy: Leidel's biographical listing describes Yorktown as managing private equity partnerships with $4 billion of capital under management investing in the energy industry, with his personal focus on oil and gas exploration and production companies.[1](https://www.whitehousehistory.org/national-council/peter-leidel) That figure is the firm's own description carried on a single biographical page and is not independently verified. Form D-derived data (below) shows smaller per-fund amounts, such as $885.2 million reported AUM for Yorktown Energy Partners XI and $218.6 million for Yorktown Energy Partners XII, so the $4 billion figure should be read as a stated, single-source number.[5](https://aum13f.com/person/peter-leidel)
## Career and education
Leidel became a [Certified Public Accountant](https://www.edgepedia.org/certified-public-accountant) in 1980 and spent the early 1980s in corporate treasury positions at Mobil Corporation (1980–83); he also worked for KPMG Peat Marwick and the U.S. Patent and Trademark Office before moving into venture capital.[1](https://www.whitehousehistory.org/national-council/peter-leidel) He received a B.B.A. with Honors from the University of Wisconsin and an M.B.A. from the [Wharton School](https://www.edgepedia.org/wharton-school) at the University of Pennsylvania.[1](https://www.whitehousehistory.org/national-council/peter-leidel)
His venture career began at Dillon, Read & Co. Inc., where he was a Partner in the venture capital group during the 1983–97 period when the bank managed the Yorktown energy partnerships; he carried that franchise into the independent firm in 1997.[1](https://www.whitehousehistory.org/national-council/peter-leidel)
## Fund sizes and investments, by the numbers
A Form D aggregator lists Leidel as a director or executive officer across Yorktown vehicles with the following amounts; these are aggregator-derived figures and are unverified.[5](https://aum13f.com/person/peter-leidel)
- Yorktown Energy Partners XII LP: $239.8 million raised, $218.6 million reported AUM[5](https://aum13f.com/person/peter-leidel)
- Yorktown Energy Partners XI LP: $1,700.0 million target, $885.2 million reported AUM[5](https://aum13f.com/person/peter-leidel)
- Extraction Oil & Gas Holdings LLC: $197.0 million raised of a $203.0 million target[5](https://aum13f.com/person/peter-leidel)
Private Equity International lists Yorktown Eagle Partners, opened and in market as of March 2023.[2](https://www.privateequityinternational.com/institution-profiles/yorktown-partners.html) A Form D for Yorktown Eagle Partners LLC lists Leidel as an executive officer, with $9.3 million raised as of that filing.[5](https://aum13f.com/person/peter-leidel)
One early transaction is documented in a primary source: an October 9, 1997 Schedule 13D shows Yorktown beneficially owned 1,764,216 shares (6.83% of outstanding) and Yorktown II owned 555,556 shares (2.15%) of TransMontaigne common stock, and that on the same date Yorktown sold 250,000 shares at $18.00 per share.[4](https://www.sec.gov/Archives/edgar/data/755199/000095016297000931/0000950162-97-000931.txt)
## References
1. Peter Leidel, White House Historical Association National Council biography: https://www.whitehousehistory.org/national-council/peter-leidel
2. Yorktown Partners, Private Equity International institution profile: https://www.privateequityinternational.com/institution-profiles/yorktown-partners.html
3. SEC EDGAR exhibit naming Yorktown X Associates managing members (2025): https://www.sec.gov/Archives/edgar/data/1577919/000114036125043354/ef20059723_ex99-1.htm
4. SEC Schedule 13D, TransMontaigne, October 9, 1997, signed by Peter A. Leidel: https://www.sec.gov/Archives/edgar/data/755199/000095016297000931/0000950162-97-000931.txt
5. Peter Leidel, AUM 13F Form D tracker (aggregator, unverified): https://aum13f.com/person/peter-leidel
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*Topic: Encyclopedia › Society and history › Economics and business › Finance › Venture capital and private equity › Venture and private-equity investors (people)*
*Initially written Sep 17, 2026 · Edited: Oct 11, 2026; Oct 15, 2026*
*Copyright 2026 EdgeChat AI, a subsidiary of Biostate AI.*
License: Edgepedia Community License 1.0, https://www.edgepedia.org/edgepedia/license