PORTLAND, Ore. -

Oregon Lottery Director Larry Niswender is retiring the end of November.

In a memo to his staff Monday, Niswender said he's happy with what he's accomplished and will work to ensure a smooth transition.

Niswender joined the agency as deputy director in 2005. He was appointed interim director in 2010 and got the permanent job a year later.

Although the lottery has been lucrative on Niswender's watch, his tenure hasn't been smooth. In 2011, he overcame an accusation that he sexually harassed a female manager and, more recently, he has been criticized for the agency's failure to do more to help addicted gamblers.

The Oregonian newspaper reports that Niswender's departure comes as it is preparing a series of articles about the lottery and problem gambling.