Thomas Mark Barrett (born December 8, 1953) is an American diplomat and politician who served as the United States ambassador to Luxembourg from 2022 to 2025.

His father was a World War II veteran who was awarded the Distinguished Flying Cross in 1944 for 30 missions over Germany as a navigator.

[11] In 1992, after U.S. Representative Jim Moody announced his intention to run for the United States Senate, Barrett successfully ran to succeed him.

He also worked to modernize the Community Reinvestment Act and frequently voiced his support of Milwaukee's Midwest Express Airlines.

[23] The city's downtown experienced a major construction boom that included several new skyscrapers, such as the Northwestern Mutual Tower and Commons.

Where he praised the city's past achievements and outlined his plan to increase green jobs, economic development and workforce training in the coming year.

"We will make smart investments, continue to build strong partnerships, provide training to our workforce and improve our public schools.

Barrett attended a White House Recovery and Reinvestment Act Implementation Conference hosted by Biden.

The conference addressed questions from state, county, and local government officials on how to effectively oversee the spending of Recovery Act funds.

On March 23, 2020, citing concerns of the ongoing coronavirus pandemic, Mayor Barrett sent a letter to Governor Tony Evers, State Senate Majority Leader Scott L. Fitzgerald and Speaker of the State House Robin Vos, requesting that the April 7 elections (including the mayoral election, as well as Wisconsin's presidential primaries and others races) be conducted using mail-in ballots only.

[27] Barrett lent his backing to a proposal authored by the Department of City Development under which business improvement districts would be allowed to spend money on assisting companies and property owners hurt by the pandemic without needing Common Council approval.

The announcement followed the completion of a comprehensive independent review of the finances and non-instructional operations of MPS commissioned by the governor and mayor in October 2008.

[35] On August 25, 2021, President Joe Biden announced his intent to nominate Barrett to serve as the United States Ambassador to Luxembourg.

[42] In August 2009, Doyle announced his decision to not seek reelection to a third term in 2010, leading many to believe Barrett would run for governor.

[45] A story in The Politico reported that President Barack Obama's political director Patrick Gaspard met with Barrett on November 4, 2009, amid speculation that the White House wanted him to run for Governor of Wisconsin.

In an e-mail thanking supporters, Barrett said his campaign had more than $1.5 million in the bank, a significant start given that he did not declare candidacy for the Democratic primary until November 15, 2009.

Barrett ended months of speculation by officially announcing on March 30, 2012, that he would enter the race for governor.

[56] The American Federation of State, County and Municipal Employees and the Wisconsin Education Association Council, which already supported another Democrat who had announced, had met with Barrett in late December 2011 and tried unsuccessfully to keep him from entering the race.

The results represent a six-point increase for Walker over Barrett since Marquette's earlier poll in late April.

[59] Odysseas, a contributor to the progressive blog Daily Kos, had questioned if the Marquette University Law school poll oversampled "right wingers."

[5] Barrett was the subject of national news headlines when he was attacked outside the Wisconsin State Fair on August 15, 2009, by a man wielding a pipe.

Barrett's injuries included broken teeth, a permanently damaged hand, as well as blows to the head where he was struck with the pipe.