As a stage actress in Dallas, Clinkenbeard got involved in voice-over when fellow voice actress Laura Bailey brought her to Funimation for an audition. Her first voice role was in Dragon Ball GT; her first lead role was Éclair in Kiddy Grade. Midway through the Kiddy Grade series, director Justin Cook made Clinkenbeard the ADR director on the rest of the episodes. Her other major role early in her career was Rachel Moore in the detective anime show Case Closed. She would later direct along with Mike McFarland on Fullmetal Alchemist which came out in November 2004 on Cartoon Network.
Clinkenbeard went on to provide the voices of Monkey D. Luffy in One Piece, Erza Scarlet in Fairy Tail, Riza Hawkeye in Full Metal Alchemist, Moka Akashiya’s inner personality in Rosario + Vampire and Yuko Ichihara in xxxHolic.