Andrew Goldstein led the public corruption unit in the US attorney's office in Manhattan where he worked under Preet Bharara. According to Fox News, “Goldstein contributed a combined $3,300 to Obama's campaigns in 2008 and 2012”
Goldstein, with special counsel colleagues Jeannie Rhee and Aaron Zelinsky, was involved in handling the case of former Trump campaign adviser George Papadopoulos. In October 2017, it was revealed that Papadopoulos pleaded guilty to lying to the FBI and was cooperating with Mueller's investigation.
Goldstein was part of the team that secured a 2015 corruption conviction of Sheldon Silver, the former Democratic speaker of the New York State Assembly. (Silver's conviction was overturned by a federal appeals court in July 2017, which ruled that there was an issue with the judge's instructions to the jury.)
Goldstein also successfully prosecuted three men associated with a New York City municipal fraud and kickback scheme project called CityTime. The investigation examined more than 150 bank accounts, hundreds of thousands of documents and more than 100 witnesses, according to the Justice Department.