Dan Nielsen is a native of Washington State. He received his undergraduate degree in Accounting from Central Washington University. He earned a Masters of Business Administration degree from University of Nevada, Las Vegas in 1992. Mr. Nielsen has been in law enforcement since 1975. He began his career in the U.S. Army as a Military Police Investigator. Following his military service, Mr. Nielsen served as a Police Officer with the Seattle Police Department. He served as a patrolman with that department for seven years. Upon receiving his undergraduate degree, Mr. Nielsen began service with the FBI.

Since entering on duty with the FBI in 1986, Mr. Nielsen has had several assignments. His first office of assignment was Las Vegas where he worked organized crime matters, specializing in labor racketeering. It was in Las Vegas that Mr. Nielsen earned his certification as a Technically Trained Agent. Mr. Nielsen was transferred to Los Angeles in 1992. Mr. Nielsen was one of four agents assigned to the civil rights investigation into the beating of Rodney King by members of the Los Angeles Police Department.

In 1997, Mr. Nielsen was promoted to Supervisory Special Agent at FBI Headquarters within the Computer Intrusions Unit, now a part of the Cyber Division. In 1999, Mr. Nielsen was transferred to Indianapolis to supervise the White Collar Crime program. After three successful years in that program, Mr. Nielsen briefly served as the Violent Crimes Supervisor. The last two years of his service in Indianapolis were spent between Acting Assistant Special Agent in Charge and supervising a newly established Cyber Crimes Squad. In 2004, Mr. Nielsen was promoted to Assistant Special Agent in Charge of the Portland Division.

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