He previously served as a United States magistrate judge of the same court from 2018 to 2024.

[2] Kazen was recommended as a district judge by Senators John Cornyn and Ted Cruz.

President Biden nominated Kazen to the seat vacated by Judge Vanessa Gilmore, who retired on January 2, 2022.

[7] On January 8, 2024, the United States Senate invoked cloture on his nomination by a 73–15 vote.

[9] He received his judicial commission on January 12, 2024,[10] and he was sworn in by Judge Saldaña on the same day.