Lex Mentis™Attorney Check

New York attorney · Reg. #5215769

Andrew James Sioson

Registered (registry: Currently registered)

Current employer

Sidley Austin · Washington, DC · since at least September 2026

Admission

Admitted 2014, First Department · BERKELEY - BOALT

Employment history

Compiled from NYS Office of Court Administration registration records, published NY Appellate Division decisions, and SEC orders against attorneys; current as of October 2026. Not an official record; verify with the NY Courts Attorney Search.