From 2008 to 2023, Guider was an attorney at Coats Rose Professional Corporation. In 2023, he joined Longwell Riess, L.L.C. as a housing attorney.[1]
Tax court service
On May 9, 2024, President Joe Biden nominated Guider to serve as a judge of the United States Tax Court.[2] He was nominated to the seat vacated by Judge Richard T. Morrison, whose term expired on August 28, 2023.[3] On July 10, 2024, a hearing on his nomination was held before the Senate Finance Committee.[4] On July 25, 2024, his nomination was reported out of committee by a 27–0 vote.[5] On September 25, 2024, the United States Senate confirmed him by a voice vote.[6] He was sworn in on October 3, 2024.[7]