Marianos

He most recently served as Assistant Director in the Office of Public and Governmental Affairs, and as Special Agent in Charge ATF's Washington Field Division.

Marianos began his career with ATF in September 1987 in the Chicago Field Division where he worked on complex-gang investigations. and was recognized as a national expert using the continuing criminal enterprise and RICO statues to dismantle some of the most dangerous street gangs in America.

In 1997 Marianos was promoted to resident agent in charge of the Colorado Springs Field Office, Phoenix Field Division where he oversaw large-scale investigations into violent crime, to include outlaw motorcycle gangs, ethnic street gangs, and firearms trafficking organizations. In 1998 he was named Incident Commander and led ATF in the shooting investigation at Columbine High School in Littleton, Colorado. During this tour Marianos received two Distinguished Service medals and was ATF employee of the year.

In 2005, Marianos was promoted to deputy chief of the Public Affairs Division at national headquarters, and in 2008 became deputy chief of the Special Operations Division, overseeing five special response teams and operations throughout the country.

Marianos was born in Chicago, Ill., and earned a Bachelor of Science degree in criminal justice from Northern Illinois University and a Masters in Police Executive Leadership in 2003 from University of Colorado. He is currently on staff at Georgetown University, where he teaches several advance Masters level courses for law enforcement executives worldwide.