LAWYER PROFILE
Daniel A. Mullen

Daniel A. Mullen

USA 2026

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Steptoe LLP
 Steptoe LLP

Ranked in 2 practice areas

Energy: Electricity (Regulatory & Litigation)

USA - Nationwide

4 years ranked

Energy: Oil & Gas (Regulatory & Litigation)

USA - Nationwide

11 years ranked

About

Provided by Steptoe LLP

Practice Areas

Energy | Electric Power | ESG, Climate & Sustainability | Energy Transition | Energy Litigation | Data Centers | Financial Services Investigations & Enforcement

Career

Dan Mullen, chair of Steptoe's Energy group, counsels clients on energy and commodities enforcement matters and government investigations and litigation, and assists clients with the development of energy regulatory compliance programs. Dan focuses on defending clients in investigations by the Federal Energy Regulatory Commission (FERC) and US Commodity Futures Trading Commission (CFTC).

Prior to joining Steptoe, Dan served as a Division of Investigations Branch Chief within the Office of Enforcement at FERC. In this position, he helped develop FERC's current enforcement regime and oversaw and conducted investigations and litigations against companies participating in the wholesale electricity and natural gas markets. Dan focused on investigations concerning energy market manipulation, reliability and violations of FERC-jurisdictional statutes, regulations and tariffs.

Professional Memberships

FIA

Energy Bar Association

Infrastructure and Regulated Industries Section, American Bar Association

Chambers Review

Provided by Chambers

Chambers Guide to the USA

Energy: Electricity (Regulatory & Litigation) - USA - Nationwide

Band 4
Individual Editorial
Daniel Mullen's regulatory practice spans the oil and gas and power sectors. He frequently handles sensitive FERC and CFTC investigations and enforcement proceedings.
Learn more about this teamView ranking table

Energy: Oil & Gas (Regulatory & Litigation) - USA - Nationwide

Band 5
Individual Editorial
Daniel Mullen's regulatory practice spans the oil and gas and power sectors. He frequently handles sensitive FERC and CFTC investigations and enforcement proceedings.
Learn more about this teamView ranking table

Strengths

Provided by Chambers

  • Daniel Mullen excels at providing strategic, big-picture compliance support, skillfully assembling the right mix of team members to meet each client’s unique needs with precision and foresight.

    Energy: Electricity (Regulatory & Litigation)Chambers Guide to the USA

Ranked Individuals at Steptoe LLP (94)

California

District of Columbia

Illinois

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