John Fiedler John Donald Fiedler was the shrill - voiced , bald - pated character actor who played Mr . Hengist in the second season episode . He filmed his scenes between Tuesday and Wednesday at Desilu Stage 9 and Stage 10 . He was perhaps best remembered for his later role as Mr . Peterson on the CBS comedy series and especially for giving voice to the beloved character of in ' s animated films and television programs . Despite these roles and despite having appeared opposite such legendary performers as , , , , and , Fiedler said in a 1985 appearance on NBC ' s " Today " show , " " One of my favorite parts was an episode of " Star Trek " where I played Jack the Ripper . " " Early life and career . Fiedler was born in Platteville , Wisconsin , on 3 February 1925 . At the age of 5 , he moved with his family to Shorewood , Wisconsin . After graduating from Shorewood High School in 1943 , Fiedler enlisted in the United States Navy , serving stateside until World War II ended in 1945 . The following year , he moved to New York City and joined the Neighborhood Playhouse . He started his career in show business on the radio comedy program " The Aldrich Family " . In 1951 , he began his television career as a regular on the 1950s children ' s science fiction series " Tom Corbett , Space Cadet " . He remained on this series until 1954 , after which he made his Broadway debut in the farcical play " One Eye Closed " , which ran for only three performances in November . He made his feature film debut playing Juror # 2 in the Academy Award - nominated 1957 drama , " 12 Angry Men " . He reunited with that film ' s director , , for two more films , the first of which was the 1958 drama " Stage Struck " . This film co - starred actor Christopher Plummer and also marked the film debut of fellow TOS guest star , Roger C . Carmel . 1960s . Fiedler starred in the original Broadway productions of the Tony Award - winning plays " A Raisin in the Sun " ( 1959 - 60 ) and " The Odd Couple " ( 1965 - 67 ) . He reprised his characters from both of these plays in their respective feature film adaptations ( " A Raisin in the Sun " in 1961 ; " The Odd Couple " in 1968 ) . guest star Paul Dooley was also part of the " The Odd Couple " s original Broadway cast , but he did not reprise his role for the film . Fiedler and Dooley later reunited for an episode of " Tales from the Darkside " in 1986 , twenty years after acting together on the stage . Throughout the 1960s , Fiedler also guest - starred on such television shows as " The Twilight Zone " ( including the 1960 Christmas episode , " The Night of the Meek " , with Meg Wyllie ) , " The Many Loves of Dobie Gillis " ( including an episode with William Schallert ) , " Alfred Hitchcock Presents " , " My Favorite Martian " ( starring Ray Walston ) , " The Munsters " , " Perry Mason " , " Get Smart " , and " Bewitched " ( including an episode with Peter Brocco ) . Some of his notable film credits during the 1960s include the 1962 romantic comedy " That Touch of Mink " ( with Willard Sage ) , the 1964 comedy " Kiss Me , Stupid " ( with Henry Gibson and Ray Walston ) , and the 1969 Western . The latter film also featured four other one - time TOS guest stars : Kim Darby , Alfred Ryder , Jeff Corey , and Ron Soble . Fiedler voiced the character of Piglet for the first time in the 1966 animated film , " Winnie the Pooh and the Honey Tree " , followed in 1968 by " Winnie the Pooh and the Blustery Day " . His fellow TOS guest actor Clint Howard was the voice of Roo in this production . Throughout the next thirty - seven years , Fiedler voiced Piglet in six more feature films ( including two more with Howard in the 1970s ) , three television series , three TV specials , several direct - to - video productions , and even the video game , " Kingdom Hearts " . Later career . Fiedler ' s best - known live - action TV role is that of timid , henpecked Emil Peterson , one of Dr . Robert Hartley ' s quirky patients on the Emmy Award - nominated series , " The Bob Newhart Show " . Fiedler appeared in many episodes throughout the entire run of this series , from 1972 through 1978 . Fiedler was also a regular on the short - lived cult TV series " Kolchak : The Night Stalker " , which lasted from 1974 through 1975 . Paul Baxley was a regular guest actor on this series . Another short - lived series on which Fiedler starred was 1984 ' s " Buffalo Bill " , co - starring guest actress Joanna Cassidy . Fiedler also co - starred with Cassidy in a 1993 episode of " L . A . Law " called " Eli ' s Gumming " . Besides series regulars Corbin Bernsen and Larry Drake , the episode also featured Richard Libertini and Matt McCoy . The busy Fiedler was a guest star on many shows in the 1970s and 1980s , including " MacMillian & Wife " ( starring John Schuck ) , " Gunsmoke " ( with Bill Catching and Walker Edmiston ) , " The Odd Couple " , " Alice " ( starring Vic Tayback ) , " Three ' s Company " , " Fantasy Island " ( starring Ricardo Montalban , in episodes with Julie Cobb and Ellen Geer ) , " Quincy , M . E . " ( with Robert Ito , Tony Plana , and Garry Walberg ) , " Cheers " , and " The Golden Girls " . His film credits during this time include " The Shaggy D . A . " ( 1976 , with Vic Tayback ) , " The Cannonball Run " ( 1981 , with Adrienne Barbeau ) , and " Seize the Day " ( 1986 , with Steve Vinovich ) . In 1991 , Fiedler returned to Broadway for the first time in over twenty years , starring in a revival of " The Crucible " with Fritz Weaver . The following year , he starred in a Broadway revival of " A Little Hotel on the Side " . Fiedler continued to voice Piglet in Disney ' s various " Winnie the Pooh " productions throughout from 1974 through 2005 . He also lent his voice to the Disney films " The Rescuers " ( 1977 ) , " The Fox and the Hound " ( 1981 ) , and " The Emperor ' s New Groove " ( 2000 ) . His last project as the voice of Piglet was 2005 ' s " Pooh ' s Heffalump Halloween Movie " , with Jimmy Bennett now voicing Roo ( and David Ogden Stiers narrating ) . This movie was released on DVD nearly three months after Fiedler ' s death . Death . Fiedler died in Englewood , New Jersey on 25 June 2005 following a seven - month battle with cancer . He left behind an extraordinary career spanning 55 years and nearly two hundred film and television credits . Coincidentally , Fiedler died one day after actor / ventriloquist . Fiedler and Winchell had worked together for decades on Disney ' s " Winnie the Pooh " productions , with Fiedler voicing the character of Piglet and Winchell voicing Tigger . Fiedler ' s TOS co - star James Doohan passed away less than a month after Fiedler . Doohan and Fiedler were once roommates for a time . In 2012 , John Fiedler ' s biography was published . " What ' s His Name ? John Fiedler : The Man The Face The Voice " was released by Elizabeth Messina in April 2012 . Other " Trek " connections . Fiedler co - starred with fellow TOS actor William Windom on television on at least three occasions : in a 1964 episode of " The Farmer ' s Daughter " called " The Swinger " ; in a 1972 " Banacek " episode entitled " Project Phoenix " which also featured Seamon Glass and Percy Rodriguez ; and in the 1982 " Hart to Hart " episode " With This Hart , I Thee Wed " . Later that year , Fiedler appeared in another " Hart to Hart " episode , " Harts at High Noon " , with Graham Jarvis . Additional projects in which Fiedler appeared with other " Star Trek " performers include :