Bribery ringleader said he helped 750 families in admissions scheme

William "Rick" Singer, the ringleader of the alleged $25 million college entrance bribery scheme, said he worked with more than 750 families to get their children into college, NBC News reports.

Details: According to court documents unsealed Tuesday, Singer was recorded in a phone conversation saying he helps "the wealthiest families in the U.S. get their kids into school" and that he's successfully opened 761 "side doors" to admission. Singer pleaded guilty Tuesday to federal charges of racketeering, conspiracy, money laundering conspiracy and obstruction of justice.

Go deeper: Read more about the cheating scheme uncovered in Operation Varsity Blues