Along with Daniel Branca, Freddy Milton, Daan Jippes, and Volker Reiche, Vicar was one of the Disney Duck artists who brought (non-reprinted) quality back to American Disney comics, thanks to Gladstone Comics' extensive use of his work during the line's first (1986-1990) incarnation. His myriad efforts remained a mainstay of all American Disney lines up through and including Boom! (cf. the stories drawn by him that were dialogued by Joe Torcivia).
The best way that I can describe Vicar's style is that it was the Duck-comics' equivalent of "comfort food." He didn't wow me with a splashy early effort, as Don Rosa did with "The Son of the Sun", or Kari Korhonen did with "Sons of the Moon". His work never possessed the slickness of Branca or Cesar Ferioli, or the cuteness and cleverness of Massimo Fecchi. The most memorable Vicar stories were generally memorable because of the extra ounces of oomph that his co-creators gave them (hi, Joe!). But he was steady and reliable, and his stuff was always high-quality. Indeed, it's thanks to him and his fellow Gladstone "creationists" that I came to expect high-quality original work in American Disney comics as a matter of course. Those with longer memories (hi again, Joe!) can attest to the fact that there was a time when the hope of once again seeing anything close to Vicar-level quality in American Disney comics seemed like a true pipe dream.