Nan Grogan Orrock is an American politician serving as the Democratic State Senator in the Georgia State Senate, representing Senate District 36 in eastern Atlanta. Following the 2006 retirement of State Senator Sam Zamarripa, Orrock was a candidate for his district; in the Democratic primary held on July 18, 2006 Orrock defeated Grace Davis to win a seat in the State Senate since she has no Republican opponent for the general election. She was sworn into office in 2007. She was previously a member of the Georgia House of Representatives from 1987, representing the 58th district. She was the Vice-Chair of the House Democratic Caucus and the former Majority Whip, the first woman to ever hold this role. Orrock was once a member of American Legislative Exchange Council (ALEC), but has since been critical of their influence.