Garry Trudeau was assisted by inker Don Carlton (Alter 1990, 66). Carlton’s association with Trudeau began in the early 1970s, and his responsibilities grew to include lettering of the strip. The association endured for decades (Walker 2010, 30–31).
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References:
Alter, Jonathan. 1990. “Real Life with Garry Trudeau.” Newsweek, October 15. Microfilm.
Walker, Brian. 2010. Doonesbury and the Art of G. B. Trudeau. New Haven: Yale University Press.