Robert Schlesinger commented: Pittas was far worse in the performance (of the same run) that I attended. And what cannot be heard in the recording (as usual) is that his voice was so tiny he could hardly get over the orchestra.
A native of New York City, Pittas made his debut in Pittsburgh in 2003 (as Rodolfo). After a few years in the US provinces, he made it to the Met, where he sang 64 performances from 2005 to 2016, first as a comprimario (Araldo in Don Carlo, Cassio, Arturo in Lucia, Erster Gefangener, First Knight in Parsifal, Tybalt), then as Macduff, Nemorino, Tamino, Rodolfo and Alfred in Fledermaus. At the Vienna Staatsoper, he got a Macbeth first night in 2009, but just eight performances overall (six as Macduff, two as Alfredo). He also appeared in Munich, Dresden, at the Deutsche Oper Berlin and at Covent Garden.
His career didn't last long; after 2017, he performed irregularly, and after 2020 just occasionally. Around that time, he founded and directed an "opera company" that doesn't stage opera but only operatic concerts in Charleston, South Carolina.
Reference 1, reference 2 and picture source
I wish to thank Helmut Krautschneider for the recordings (Macbeth 1).