[3] He was in the United States Navy, Naval Aviation from 1968 to 1973, where he became a lieutenant and served on the aircraft carrier USS John F. Kennedy (CVA-67).

[3] He was in private practice in Billings, Montana from 1978 to 1995, where he was recognized as "one of the ablest lawyers in the state", holding various leadership roles in organizations in the legal community.

He served as chief judge from 2001 to 2008, and declared his intent to retire in December 2010,[7] finally assuming senior status on August 16, 2011.

Molloy ordered the company to pay over $54.5 million dollars to the federal government for investigation and cleanup of this Superfund site.

[7] In 2008 the US Fish and Wildlife Service removed a segment of the gray wolf population from the list of threatened and endangered species.