Previously, he served as an Assistant United States Attorney in the Northern District of Illinois from 1999 to 2010.

During his time in the U.S. Attorney's Office, he served as a Deputy Chief in the Narcotics and Gangs Section for several years, where he helped lead the District's Anti-Gang and Project Safe Neighborhoods programs.

He clerked for Michael Stephen Kanne of the United States Court of Appeals for the Seventh Circuit.

[1] On August 3, 2017, he was nominated to be the United States attorney for the Northern District of Illinois by President Donald Trump.

Both senators from Illinois, Dick Durbin and Tammy Duckworth released a joint statement that Lausch should remain in office in the new administration to complete sensitive investigations.