Legal Representation. Theo Sedlmayr, Esq., Adeline Ferretti, Esq., and Sebastian Zar, Esq. for Sedlmayr Associates, P.C Business Affairs. Dan Getz .The official Post Malone YouTube Channel. .Austin Richard Post born , known professionally as Post Malone, is an American rapper, singer and songwriter. He has gained acclaim for blending musical genres including hip hop, pop, trap, and rock, his introspective songwriting, and his laconic vocal style..