Sean Thomas Casten (born November 23, 1971) is an American businessman and politician serving as the U.S. representative for Illinois's 6th congressional district.

Casten began his career working at consultancy Arthur D. Little, where he did fuel chain analyses for the company's chemical engineering group. From 2000 to 2007, he served as the president and CEO of Turbosteam Corporation

Casten announced his candidacy for the United States House of Representatives in Illinois's 6th congressional district in September 2017.[2] He defeated six other contenders in the 2018 Democratic primary to become the party's nominee against six-term incumbent Republican Peter Roskam.

In 2022, Casten faces incumbent Representative Marie Newman, elected from Illinois's 3rd congressional district in the Democratic primary. The 2022 reapportionment overlapped the new 6th district with the former 3rd district.

Gwen Casten's high school's Empowerment Club, which she founded, took to Instagram to commemorate her life, writing: "There are no words that can begin to describe the loss we are feeling"

Gwen was a leader and a friend ... She was a highly accomplished student at North, being involved in various activities, from Changemakers, band, NHS, math team, and tennis, all while being on the high honor roll.

The teenager graduated from Downers Grove North High School in May and was headed to the University of Vermont in the fall to study environmental science.

The club added that Gwen was "always there to help anyone in need and give a listening ear," and described her as a ally who "did whatever she could to support and amplify [People of Color's] voices."

Casten's office did not add any information about her cause of death. The Chicago-Tribune reports that Downers Grove police said they were called to a home in the area Monday,

"This morning, Congressman Casten's beloved daughter, Gwen (17), passed away," the tweet from the Democrat, who was elected in 2018, read. "The Casten family requests privacy, and we will be issuing no further comment during this heartbreaking time."