Lincoln police say an associate director of a national child welfare organization is accused of exposing himself to some teenage girls at a Lincoln hotel. 

Officer Katie Flood says 68-year-old Steven Preister, of Washington, D.C., confronted four girls as they came out of a stairwell at the Cornhusker Marriott between 9:30 p.m. and 10 p.m. Monday and yelled at them for being too loud. He was wearing only a T-shirt and appeared to be intoxicated. 

The girls were staying at the hotel while attending a leadership conference. Flood says two adult chaperons also saw what happened. 

Preister has already pleaded not guilty to misdemeanor charges of public nudity and disturbing the peace. 

Preister is associate director of the National Child Welfare Resource Center for Organizational Improvement.