The Muppets
In 1976, Rowlf joined the recurring cast of The Muppet Show as the show's pianist. Rowlf also played Dr. Bob, the wisecracking doctor in the recurring medical drama parody skit "Veterinarian's Hospital", alongside nurses Janice and Miss Piggy. Though considered one of the main characters, he rarely interacted with any of the backstage plots involving the show's weekly guest stars.
Rowlf achieved movie stardom with his appearance in The Muppet Movie (1979). The film depicts Rowlf's origin as a musician, at a piano bar, who is discovered by Kermit while on his way to Hollywood. In the scene, Rowlf and Kermit sing the duet "I Hope That Somethin' Better Comes Along!", a song about their troubles with women. Afterwards, Rowlf leaves the bar and joins Kermit and the other Muppets on their trip to Hollywood in search of fame and fortune. He later plays the harmonica during Gonzo's song "I'm Going to Go Back There Someday".
In 1984, Baby Rowlf debuted playing a toy piano during a musical number in The Muppets Take Manhattan. This fantasy sequence with the Muppets as babies was so popular that it resulted in the successful animated cartoon spinoff Muppet Babies. He was voiced on that program by Katie Leigh.
Jim Henson's last public performance as Rowlf before his death was as guest on The Arsenio Hall Show in 1989. For several years afterward, the character was retired out of deference to Henson's memory (only returning for silent cameos in The Muppet Christmas Carol and Muppet Treasure Island), as he was both the first Muppet to achieve popularity and, according to some sources, the character closest to Jim Henson's personality, with Henson's son Brian saying in the introduction to episode 117 of The Muppet Show: "Kermit was my father's best known character, but a lot of people think he was more like Rowlf in real life except he couldn't play the piano as well."
Since 1996, Rowlf has been portrayed by puppeteer Bill Barretta. Barretta has gradually transitioned into the role. Rowlf's first words since Henson's death were in the second episode of Muppets Tonight. Rowlf also had several lines of dialogue in The Muppet Show Live (2001) and spoke two lines of dialogue ("Hey, Kermit!" and "Yeah! Heh, heh. Oh!") in It's a Very Merry Muppet Christmas Movie (2002). In 2005, Rowlf had a 190-word monologue in the second episode of Statler and Waldorf: From the Balcony. Rowlf appeared in the "Keep Fishin'" music video for rock band Weezer. Although he's only briefly seen, Rowlf had a more prominent role in the behind-the-scenes making-of special that accompanied it, Weezer and the Muppets Go Fishin'.
Additionally, Bill Barretta recorded the vocals as Rowlf singing "The Christmas Party Sing-Along" for the 2006 The Muppets: A Green and Red Christmas album.[citation needed]
Rowlf and Kermit appeared together at the 2011 Disney D23 Expo to honor Jim Henson's posthumous induction as a Disney Legend, singing a live duet of "The Rainbow Connection", as they were Henson's first two Muppet characters.[7]
Rowlf appears in The Muppets (2011), initially saddened he wasn't included in the montage depicting the principal Muppets being reunited (Rowlf was asleep, and was simply woken up by Kermit and easily convinced to join the cause), and helps rebuild the Muppet theater. He also performs "Smells Like Teen Spirit" in a barbershop quartet with Sam the Eagle, Beaker, and Link Hogthrob during the Muppet Telethon, as well as an unwilling (and captive) Jack Black.
As of 2014, Rowlf is on long-term display at the Center for Puppetry Arts in Atlanta, Georgia.[8]
In 2019, Rowlf appeared with Darci Lynne on America's Got Talent: The Champions, singing "Can't Smile Without You".