Since 1998, Brockman has worked as an independent insurance agent in Oklahoma City, Moore and Norman. On April 14, 2010, Brockman was charged with willful failure to file a federal tax return for 2003, 2004 and 2005. According to court filings, Brockman earned more than $1.2 million in gross income from his insurance business during those three years, but did not timely file federal income tax returns. On Oct. 12, Brockman pleaded guilty to willfully failing to file a federal tax return for 2003 and 2004.