Paul Singer and Lloyd Blankfein were among the Wall Street leaders who appeared Wednesday at the second annual Out on the Street LGBT Leadership Conference held at Bank of America's Manhattan offices.

Blankfein, the chief executive officer of Goldman Sachs, in February created a stir when he appeared in a video for the Human Rights Campaign (HRC) urging Americans to support gay marriage.

At the summit, Blankfein discussed reaction to his involvement in the campaign.

“It was important for our recruiting, for being able to move people around the world, for a number of business reasons, and then of course, last but not least, how could you not be on the side of what seems like a basic civil rights movement?” BloombergBusinessweek quoted Blankfein as saying.

He also revealed that while client reaction was “generally positive,” one client threatened to fire the firm over his stand. “I won't say the name, but if you heard the name it wouldn't surprise you,” he teased.

Singer, the founder of hedge-firm Elliott Management who also played a key role in making marriage equality a reality in New York, suggested Mitt Romney's anti-gay rhetoric was all talk.

“I don't think it's going to be a harsh environment [for gay rights] in a Romney administration,” the 67-year-old Singer said. “It's a process if Mitt Romney is elected – it's a process of pressure, education.”