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.

He won the general election, beating the Republican nominee, Orland Park mayor Keith Pekau, on November 8, 2022.

[1] Born in Dublin, Ireland, to American parents,[2] and raised in Hartsdale, New York, Casten earned a Bachelor of Arts in molecular biology and biochemistry from Middlebury College in 1993.

[3] Casten began his career working at consultancy Arthur D. Little, where he did fuel chain analyses for the company's chemical engineering group.

[13] Casten announced his candidacy for the United States House of Representatives in Illinois's 6th congressional district in September 2017.

[15] This race was viewed as one that Democrats needed to win in order to regain control of the U.S. House of Representatives for the first time since the 2010 elections.

[21] For his first two terms, Casten represented a district covering parts of five counties in Chicago's western suburbs, including Wheaton, Palatine, and Barrington.

To make up for the loss in population, the district was pushed further into Cook County, absorbing a slice of southwestern Chicago proper.

As of January 2023[update], Casten had voted in line with President Joe Biden's stated position 99% of the time during the 117th Congress.

[28][29] The Clean Industrial Technology Act of 2019 would have established a program to incentivize innovation in greenhouse gas emissions from manufacturing.

In Congress, Casten has led efforts to "turbocharge FERC's profile" and to utilize the agency to promote the clean energy transition.

The bill would allow history books to go into more depth on African American struggles and set up a reparations commission for those with enslaved ancestors.

[46][47] In March 2024, Casten criticized Israeli Prime Minister Benjamin Netanyahu for the "utter disregard for Palestinian lives".