​Under EPA Administrator William Reilly, Mr. Ludwiszewski served as General Counsel at the United States Environmental Protection Agency in Washington. Before assuming that position, he served as Assistant Administrator for Enforcement at EPA. Earlier, Mr. Ludwiszewski held a number of senior positions at the United States Department of Justice, with an emphasis in environmental litigation. First, he was Special Counsel to the Assistant  Attorney General for the Environment and Natural Resources Division. Subsequently, Mr. Ludwiszewski was Associate Deputy Attorney General.

Some significant matters he has handled include the defense of complex toxic tort "contaminated community" cases, the defense of important environmental civil enforcement cases; the successful challenge of major environmental regulations; the defense of large environmental criminal matters; and the prosecution of litigation against the United States.  Additionally, he has handled noteworthy Supreme Court litigation, including Nollan v. California Coastal Commission and First English Evangelical Church v. Los Angeles.

Mr. Ludwiszewski was a member of the Administrative Conference of the United States.  He has written and spoken extensively on administrative law and environmental issues.  Mr. Ludwiszewski was Vice Chairman of the National Environmental Enforcement Council and of the American Bar Association Committee on Environmental Crimes and Enforcement.  He has been listed in Washingtonian magazine’s Best Environmental Lawyers List, the Washington Post magazine’s Best Lawyers in America^®, and Chambers USA.  In August 2009, he was also named as a finalist for the top Environmental lawyer in Washington by The Washington Business Journal. Mr. Ludwiszewski is a member of the Environmental Law Institute’s Board of Directors.  Additionally, he served for seven years on the seventeen-person Executive Committee responsible for managing the Firm.

Before joining the Justice Department, Mr. Ludwiszewski was a judicial law clerk to Judge Henry J. Friendly of the U.S. Court of Appeals for the Second Circuit. A magna cum laude graduate of Harvard Law School in 1984, Mr. Ludwiszewski was Editor of the Harvard Law Review. He earned his Bachelor of Science degree at Northeastern University in Boston summa cum laude in 1981.