Maynard Frank Wolfe (Rube Goldberg Inventions) praised Holtz as "the extraordinary collector conservator computer wizard and historian of cartoon art." Holtz's blog Stripper's Guide posts such regular series as "News of Yore" (including news items from back issues of Editor & Publisher), "Obscurity of the Day" (little-known strips) and a series on George Herriman. One such obscurity discussed by Holtz is The Captain's Gig, a little-known strip by Virgil Partch; it ran as a daily and Sunday from 1977 to 1979. Other obscurities rediscovered by Holtz go back to the earliest published comic strips. He also surveys the history of comic strip syndicates, along with the detailed information he provides on writers and artists. In a 2002 issue of Hogan's Alley, Holtz wrote about his almost accident