U.S. District Judge Pamela L. Reeves set sentencing for 49-year-old Scott Thibault of Maryville for Dec. 1 in Knoxville. Thibault entered the plea Wednesday.
Prosecutors say Thibault has also agreed to plead guilty to one-count information of use of the mail to defraud.
Prosecutors say Thibault falsely represented himself as an attorney in an adoption case and forging the name of U.S. District Judge Thomas Varlan on the documents.
Thibault told the court he obtained at least $400,000 from the victims to further his scheme to defraud and obtain money.