Harold Teen was a popular, long-running comic strip written and drawn by Carl Ed (pronounced "eed"). Publisher Joseph Medill Patterson may have suggested and certainly approved the strip's concept, loosely based on Booth Tarkington's successful novel Seventeen. Asked in the late 1930s why he had started the strip, Ed answered, "Twenty years ago, there was no comic strip on adolescence. I thought every well-balanced comic sheet should have one."
Sundaes on Sunday 
Under the title The Love Life of Harold Teen, it debuted as a Sunday strip in the Chicago Tribune on May 4, 1919, and a few months later it was nationally syndicated by the Chicago Tribune New York News Syndicate. A daily strip was added later that year. The strip was so successful in depicting the Jazz Age that it became a minor cultural icon of its time. The principal characters were Covina High School student Harold Teen, his girlfriend Lillums Lovewell, his diminutive sidekick Shadow Smart and Pop Jenks, proprietor of the Sugar Bowl soda shop where Harold consumed Gedunk sundaes. The Sugar Bowl (aka Ye Sugar Bowl) also sold "Sodas and how" and advertised "the biggest soda in town."
Pop Jenks was inspired by the real-life Pop Walters, who ran a soda fountain and stationery shop across from the high school Ed attended in Moline, Illinois. The Gedunk sundaes reached such popularity that Ed had to answer requests for a recipe. In the 1928 Harold Teen film, the sundae is a soupy concoction of ice cream and hot chocolate which is eaten by "gedunking" a large ladyfinger cookie in it. As noted in Random House’s Historical Dictionary of American Slang, the word "gedunk" soon entered military slang to refer to snack shops and ice cream beginning with a 1931 usage in Leatherneck Magazine.
The success of the strip led to toys, figurines, pins and other products. Reprints appeared in Popular Comics, and Whitman published a Better Little Book, Harold Teen in Swinging at the Sugar Bowl (1939). During World War II, Harold joined the Navy. In the post-war period, the strip failed to retain its relevance. When Ed, who lived at 711 Michigan Avenue in Evanston, Illinois, died in 1959, his once-popular comic strip died with him.
Three different topper strips by Carl Ed ran on his page, positioned beneath Harold Teen: The Absent Minded Professor (early 1930s), Josie (1930s and early 1940s) and Myrtle (1940s).
Carl Ed received writing credit for both film adaptations of Harold Teen. Tap dancer Hal Le Roy had the title role in the 1934 movie musical Harold Teen. In the 1928 silent version, Harold was portrayed by Arthur Lake, best known for his many performances as Dagwood Bumstead. The Educational Screen commented:
- The lovelorn hero of the comic strips is delightfully done by Arthur Lake who is the real Spirit of Seventeen. Everybody and everything you've laughed over in the papers is there, including Lillums, Horace, Beezie, the Gedunk sundae and the autographed Ford and slicker.
Willard P. Farnum (1906-1994) and Charles Flynn portrayed Harold Teen in the 1941 radio series which aired on Tuesday evenings at 7:30pm. Willard Waterman was also in the cast.
Kansas City jazz band pianist Joe Sanders wrote a song about the "Don Juan of comic strip fame", describing him as a "human love machine" and as "romance personified". A performance by the Coon-Sanders Original Nighthawk Orchestra can be heard in the March 1, 1929 episode of the Maytag Frolics radio program.