Matthew Christopher Pietras played his part like a maestro in a Tom Ford tuxedo. He floated through New York’s glittering gala circuit, sponsoring opening nights at the Metropolitan Opera and the newly renovated Frick Collection, booking private jets like they were yellow cabs, and sprinkling six-figure “donations”as if he had an endless trust fund. To anyone watching, he was the charming young patron who had cracked the code to effortless wealth. He traveled in high society like he was born to it: with 60 friends in tow for opera night and a knack for name-dropping that would make a PR flack blush.