Rogan did a short stint (1983–1985) as a civil litigation attorney in one of Los Angeles' oldest law firms (Lillick McHose & Charles).

He resigned from his firm and signed on as a Los Angeles County Deputy District Attorney, where he later was recruited to the "Hardcore Gang Murder Unit".

[citation needed] In 1994 Rogan ran for and won a special election to the California State Assembly after the previous incumbent, former GOP minority leader Pat Nolan resigned after he was convicted of charges of accepting illegal campaign contributions as a result of an FBI sting operation.

Further, as a member of the two most critical subcommittees (the Telecommunications, Trade and Consumer Protection subcommittee, and the Energy and Power subcommittee) Rogan shared responsibility for helping to craft legislation on all matters of interstate and foreign commerce and trade; interstate and foreign telecommunications, regulation of commercial practices (including the Federal Trade Commission); consumer affairs and consumer protection; product liability issues; motor vehicle safety; and all laws relating to national energy policy, including utility issues, and regulation of nuclear facilities.

He also was a member of both Speaker Gingrich and Majority Leader Dick Armey's "Kitchen Cabinet" advisory groups.

He met regularly with the Speaker and the Majority Leader to discuss political and legislative strategies and tactics during the congressional session.

In this new role, Rogan ran one of the oldest agencies in the federal government, overseeing 8,000 employees and a $1.5 billion budget.

[citation needed] Rogan left the Bush administration in early 2004, and joined the law firm of Venable LLP, where he worked as a partner in their Southern California and Washington, D.C., offices.

Senator Dianne Feinstein's judicial nominee review committee, along with the highest rating from the American Bar Association.

Senator Barbara Boxer put a hold on the nomination, citing Rogan's role in Clinton's impeachment as the reason.

Rogan planned on marrying his longtime girlfriend, Terri Lemke, but the relationship did not survive his move to Los Angeles to attend law school.

[citation needed] Rogan has authored four non-fiction books, and one work of historical fiction: House managers: President's counsel: Deposed witnesses: