New York attorney · Reg. #5862883

Mark Andrew Costello

Registered (registry: Currently registered)

Current employer

The Costello Law Firm, P.a. · Hartsdale, NY · since at least September 2026

Admission

Admitted 2021, Third Department · Nova Southeastern University Shepard Broad Law Center

Employment history

• The Costello Law Firm, P.a. · Hartsdale, NY · current

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.