Michael Dreeben, a veteran U.S. Supreme Court advocate with 105 oral arguments under his belt, will join O’Melveny & Myers in January as a partner in its appellate and white-collar practices, the firm announced Tuesday.

The longtime deputy U.S. solicitor general, widely viewed as an unrivaled expert on criminal law, retired in July after a two-year detour assisting special counsel Robert Mueller in the investigation into Russia’s election interference. In August, Dreeben took on a teaching position at Georgetown University Law Center, which he will retain in private practice.

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Hacker said hiring Dreeben does not necessarily signal a growing of O’Melveny’s appellate team, in keeping with the firm’s preference for keeping the appellate practice small. “When we say to a client, ‘You’re going to get Michael Dreeben or Jon Hacker or Anton Metlitsky or Jeff Fisher, that’s who you’re going to get. When you are asking for the A team, you’re going to get our A team.’”