Greenberg, who lives in Little Rock, Arkansas, represented House District 31, which includes portions of Pulaski and Saline counties.
Greenberg was an analyst at The Heritage Foundation, a writer for the libertarian Cato Institute, and a teacher at the high school and college level in the fields of philosophy, political science, and computer programming.
When he ran for the state legislature in 2006, he was endorsed by the incumbent in the seat, Jeremy Hutchinson, who was prohibited by term limits for running for reelection.
In May and June 2006, Greenberg placed first in the district's hotly contested primary and runoff and was elected to succeed Hutchinson in the legislative seat for which the two had once competed.
Greenberg made national news[6] when he proposed the "Edifice Complex Prevention Act" barring naming public facilities after living people.