Gregory A. Miller

On May 19, 2015, Miller was one of four Republicans on the House Civil Law and Procedure Committee—the others were Mike "Pete" Huval of Breaux Bridge, Nancy Landry of Lafayette, and Clay Schexnayder of Gonzales—who voted to table on a 10-2 vote the proposed Marriage and Conscience Act, authored by Republican Representative Mike Johnson of Bossier Parish and strongly supported by the conservative Louisiana Family Forum. Only fellow Republican Ray Garofalo of Chalmette stood with Johnson. Governor Bobby Jindal, who supported the legislation, then issued an executive order to implement the measure. Johnson said that he will in 2016, if he is reelected, re-introduce the measure because he prefers a statutory law to address the issue. Johnson explained that the measure is designed to block the state government from pulling licenses or tax benefits from a company because of the owner's counter view of same-sex marriage. Among Democrats who opposed the measure were committee chairman Neil Abramson and Joseph Bouie, Jr., both of New Orleans, Patrick O. Jefferson of Arcadia, and Alfred C. Williams of Baton Rouge.

In 2013, Representative Miller voted to increase judicial pay, to repeal mandatory retirement ages for judges, and to lessen penalties for marijuana possession. He voted to forbid the state from enforcing federal firearms restrictions and to prevent the publication of the names of those with concealed weapon permits. Miller voted for surrogacy contracts for couples seeking another woman to bear their child. He also voted to bring state law in line with federal dictates on requirements of equal pay for equal work regardless of gender.

During his campaign in 2011, Miller identified his top legislative priorities as fiscal accountability and job creation:

Miller won the seat vacated by Representative Gary Smith, Jr., a Democrat who was elected to the Louisiana State Senate. Miller defeated two opponents, one from each party: Republican Emile Garlepied, a former owner of a transportation company, and Democrat Ganesier "Ram" Ramchandran, a consulting engineer and a former member of the St. Charles Parish Council (akin to county commissions in other states). In the nonpartisan blanket primary held on October 22, 2011, Miller failed by 110 votes to win the position outright. In the second round of balloting on November 19, Miller easily won with 5,201 votes (62.3 percent) to 3,143 (37.7 percent) for Democrat Ganesier Ramachandran.

He grew up with the background of his father's reform legislative service, but Miller said that he had not seriously considered running for office until after seeing the destructive aftermath of Hurricane Katrina in 2005:

Gregory Miller graduated from the Roman Catholic De La Salle High School. In 1985, he received a bachelor's degree in political science from Louisiana State University in Baton Rouge. Three years later, he completed his legal degree from the LSU Law Center. and joined the Republican Party. Miller is also affiliated with the Chamber of Commerce, Ducks Unlimited, the River Road Historical Society, Lions International, St. Charles Borromeo Catholic Church, and the Knights of Columbus, a Catholic men's organization.

Gregory Allen Miller (born May 1962) is an American attorney from Destrehan, Louisiana, who in 2011 was elected as a Republican member of the Louisiana House of Representatives from District 56, which encompasses much of St. Charles Parish.

Miller was born at Fort Sill in Lawton Oklahoma, while his father, Ralph R. Miller (1934-2017), was stationed with the United States Army. His parents returned to Louisiana and Miller was reared primarily in his father's hometown of Norco in St. Charles Parish. Ralph Miller, a member of the Democratic Party, was elected as the state representative from St. Charles Parish from 1968 to 1980, and again from 1982 to 1992. Ralph Miller was a registered Republican at the time of his death.