In 1981, Cromer graduated with a Bachelor of Science degree in industrial management technology from Southeastern Louisiana University in Hammond.

Slidell is also represented in the House by a second Republican, Kevin Pearson of District 76, who joined Cromer in a dual town hall meeting in April 2011. Cromer is a member of the House committees on Civil Law and Procedure, Governmental Affairs, and Retirement. Pearson is chairman of the Retirement Committee. Cromer and Pearson have developed a close working relationship and often appear together at civic meetings before constituents. The two issued a joint press released on the Deepwater Horizon oil spill in the Gulf of Mexico: “The economic impact is already being felt in our community, and we will take all appropriate steps to address the situation from every possible level.” Cromer has also addressed the issue of flooding in the Slidell area and the required steps to remedy high water.

Cromer was reelected in the primary election held on October 22, 2011. He received 5,030 votes (74.9 percent) to 1,683 ballots (25.1 percent) for his intra-party rival, J. “Ron” Eldridge.

On April 22, 2012, Cromer resigned his membership in the American Legislative Exchange Council (ALEC), of which he had been the Louisiana state chairman.