He began his legal career as a law clerk to Judge Stanley Marcus of the United States Court of Appeals for the Eleventh Circuit.

[3][4] Altman served for six years as an assistant United States attorney for the Southern District of Florida, where he prosecuted hundreds of criminal cases and tried more than 20 cases to jury verdict, arguing several of them before the United States Court of Appeals for the Eleventh Circuit.

Attorneys Award for Superior Litigation Team in United States v. Mentor, the Director of the Executive Office of U.S.

He was nominated to the seat vacated by Judge Joan A. Lenard, who assumed senior status on July 1, 2017.

[9] On January 3, 2019, his nomination was returned to the President under Rule XXXI, Paragraph 6 of the United States Senate.