The Harvard Law School grad charged with torching a 9/11 memorial has lost the job he had lined up with one of the nation’s biggest law firms.

The law firm, Sidley Austin, had 600 employees in the World Trade Center at the time of the attacks. One of them died.

Bill Conlon, a partner with the firm, yesterday said it has pulled arson suspect Brian Schroeder’s employment offer since his bust.

Schroeder, 26, worked in the firm’s Manhattan office in the summer of 2008 and was expected to return full-time in January.

But that was before Schroeder surrendered to cops after allegedly setting fire Saturday to the East Side chapel. He was apparently drunk at the time.

None of the 9/11 victims’ remains were damaged, but mementos and candles left by family members were destroyed.