Daniel A. Mullen is a partner in Steptoe's Washington office, where he practices in the Energy and Financial Services Groups.

Mr. Mullen counsels clients on energy and commodities enforcement matters and government investigations and litigation, and assists clients with the development of energy regulatory compliance programs. He focuses on defending clients in investigations by the Federal Energy Regulatory Commission (FERC) and US Commodity Futures Trading Commission (CFTC) and has broad-based trial and appellate experience.

Prior to joining Steptoe, Mr. Mullen served as a Division of Investigations Branch Chief within the Office of Enforcement at the FERC. In this position, he helped develop FERC's existing enforcement regime and oversaw and conducted investigations and litigation against companies participating in the wholesale electricity and natural gas markets. His focus was on investigations concerning energy market manipulation, reliability and other violations of FERC-jurisdictional statues, regulations and tariffs.

Mr. Mullen is a frequent speaker at industry conferences, presenting on issues related to energy and commodity enforcement defense.