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I'm having a bit of a Walt Simonson moment after reading the great Modern Masters book about him and went and picked up bits I didn't have; all his Star Wars issues with Tom Palmer inks, Orion for DC, his Star Slammers series for Malibu (finished at Dark Horse) and an old DC trade called The Art of Walt Simonson. It's a funny mix of stuff and really interesting to watch his growth. It's important to note, he's always been great.
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I kick myself upon hindsight for not picking up Orion when it was coming out. I remember thinking, working in a comic shop, that I could read it anyway and was jaded enough to believe that it couldn't last and we'd get so-so fill-ins and what not. He put out 25 issues of inventive storytelling with every issue demonstrating some new trick or page design or lettering element to keep you hooked. To the point of it being very difficult to highlight one page as exceptional as they were pretty much all exceptional.
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While Simonson is often likened to Kirby, his style doen't really show Kirby as much it shows Phillipe Druillet, Bernie Krigstein, Sergio Toppi. I'm certain, however that his influences go on and on but the end product is something completely unique.
I did look for a definitive checklist to link to but all I got was Wookiepedia (for his Star Wars work). In brief, as well as all the books mentioned above, look out for his Lawnmower Man (the novel) adaptation in Bizarre Adventures #29, Temple of the Spider, a samurai story with Archie Goodwin from Thrilling Adventure Stories #2 (nice bit of Toth in there too!). Also with Goodwin, Manhunter (of course) and the Alien movie adaptation. X-Men/Teen Titans is a great looking book too, though a little of it's time (Chris Claremont!).
One final mention to letterer John Workman who always manages to compliment the power, intestity and insanity of Simonson's work with the perfect effects.
Check out the Batman below from the Art Of Simonson book. I thought "Flicking hell! It's Miller's Batman!" Simonson says "The only change I had to make on the job was to alter the Expression on Batman's face...I had originally given Bats a grin, feeling (as I still do) that a grin in the wrong place is more fightening than a snarl".
Sounds like Miller's Batman too!
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I'm not gonna call swipe but look at the two images below.
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Miller's Absolute Dark Knight cover
and...
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Simonson's Batman in action from Detective Comics #450
I'll finish by saying only that Simonson's influence is felt far and wide and is always worth revisiting.