Passage: NAME_1 NAME_2 is a Muppet character and NAME_3's most well-known creation. Introduced in 1955, NAME_4 serves as the straight man protagonist of numerous Muppet productions, most notably Sesame Street and The Muppet Show, as well as in other television series, films, specials, and public service announcements through the years. NAME_5 originally performed NAME_4 until his death in 1990; NAME_6 performed NAME_4 from that time up until his dismissal from the role in 2016. NAME_4 is currently performed by NAME_7. He was also voiced by NAME_8 in Muppet Babies and occasionally in other animation projects, and is voiced by NAME_9 in the 2018 reboot of Muppet Babies. Question: From the passage above, who are all the people who have voiced NAME_1 NAME_2 in the past? Which sentences of the above passage give the answer?