Lebrun originally assisted on the King Features Syndicate comic strip Blondie as early as 1977, furnishing the strip's owner Dean Young with gag scripts.
In 1982, Lebrun became Blondie's assistant illustrator to head artist Mike Gersher. In this capacity, Lebrun inked the lettering, backgrounds and incidental and secondary characters of the strip. Gersher left the strip in 1984 and was replaced that same year with veteran comic strip illustrator Stan Drake. Drake was the head artist of the strip until his death in 1997. Cartoonist Jeff Parker assisted with the production of the daily strip from 1996 until Lebrun's departure.
In May 1997, Lebrun took over full artistic responsibilities of the strip and was the lead artist until 2005. His final illustrations appeared in the Sunday, July 31, 2005 edition of the strip. According to comics historian R. C. Harvey, Lebrun was succeeded by John Marshall, although Marshall remained uncredited until Sunday, January 7, 2007. Marshall had been assisting Lebrun and Jeff Parker on the daily Blondie since December 2002.
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