A former Georgetown University tennis coach accused of taking kickbacks in the college admissions scandal also accepted bribes independent of the scheme’s ringleader, prosecutors charged Thursday.

Gordon Ernst, who has pleaded not guilty to federal charges, was “the most prolific of all the coaches” busted in the scheme and allegedly accepted bribes from parents of school applicants as far back as 2007, prosecutors said at a court hearing in Boston, Bloomberg reported.

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Prosecutors claimed the bribes included payoffs Ernst accepted outside of the wide-ranging college-admissions scheme hatched by mastermind William “Rick” Singer, in which he paid off coaches to name rich kids as bogus athletic recruits, prosecutors added.

“He also solicited his own bribes outside of Rick Singer,” a federal prosecutor said at the hearing, per Bloomberg.

Prosecutors didn’t elaborate on which parents handed over the bribes to Ernst outside of Singer’s scheme.

Ernst — who once taught former first lady Michelle Obama and her daughters, Malia and Sasha — was charged in March of conspiracy to commit racketeering for his role in the scheme.

Ernst, 52, allegedly pocketed more that $2.7 million in bribes in exchange for bringing at least 12 students on as bogus tennis recruits at Georgetown. He faces up to 20 years behind bars if convicted.