From Wikipedia, the free encyclopedia Marietta Sirleaf, better known simply as Retta, is an American stand-up comedian and actress. She is mainly known for her starring role as Donna Meagle on NBC's Parks and Recreation. She has appeared in several films and television shows, and has performed stand-up on Comedy Central's Premium Blend. Retta is from New Jersey, and graduated from Duke University in Durham, North Carolina. She started working in the pharmaceutical research field before moving to Los Angeles, California, to pursue a career in…