Born in Biberach, Germany, the bass Markus Raab received his training from Elsa Marx and Wicus Slabbert. His career as a singer began in 2002 at the Belvedere Competition in Vienna. His performance in the contest led to engagements at St. Gallen municipal theatre (Mazolino Pedruzzi in Max von Schilling's Mona Lisa) and at the Vienna Chamber Opera (Osmin in Mozart's Zaide). In 2002 he also took part in the Marlboro Music Festival in the USA. In the 2003/04 season, he was a member of the ensemble of the Vienna Volksoper, since which time he has appeared in the roles of Alcindoro (La Bohème), the Sheriff (Martha), Yakusidé (Madame Butterfly), the Forester (Irrelohe), Micha (The Bartered Bride), the Second Armoured Man (The Magic Flute), the Night Watchman (Die Meistersinger von Nürnberg), Masetto (Don Giovanni) as well as Antonio (The Marriage of Figaro). In summer 2004 he sang Kezal (The Bartered Bride) at the Klosterneuburg opera festival. In 2005, he made a guest appearance as Lord Syndham in Lortzing's Tsar and Carpenter at St. Gallen and sang in Schulhoff's Flammen at the reopened Theater an der Wien in summer 2006. At Bregenz Provincial Theatre, Markus Raab created the roles of the Drunken Poet and Hymen in Henry Purcell's Fairy Queen in 2007 and in the same year made his Bregenz Festival debut as John Shears in Benjamin Britten's operetta Paul Bunyan. Also in Bregenz he sang Kuno in Der Freischütz in 2008 as well as the Inn Keeper in Leigh’s musical Man of La Mancha in 2009. In the same year he made his debut in the role of Sarastro in Mozart's Magic Flute at the Musiktheater Friedrichshafen.