[1] As an undergraduate, he was inducted into Tau Beta Pi,[2] hired by Microsoft as a programmer,[3] and co-authored a paper published in the IEEE Transactions on Multimedia.

[3] While on the law review there, Barker published an article on copyright statutory damages[5] that was cited by the district court in Sony BMG v. Tenenbaum, 721 F. Supp.

Also while at the Department of Justice, the American Inns of Court selected Barker to visit London and study English law as one of two annual Pegasus Scholars.

[10] In 2024, a version of his LLM thesis paper was published in the Washington University Law Review with the title "Standing Orders: A Survey of Individual Judges’ Regulation of Practice in All Future Cases Before Them.

[22] On March 9, 2024, Barker vacated the National Labor Relations Board's final rule on joint-employer status, issued in October 2023,[23] that was set to be in effect 3 days later.

[24] On August 26, 2024, Barker paused President Biden's Keeping Families Together initiative which aims to offer a path to citizenship for immigrants who are married to U.S. citizens and living in the United States illegally.

On November 7, 2024, Barker ruled that the Biden administration lacked the authority to establish the program and to bypass Congress to create immigration legislation by executive order.