Martin Geraghty; UK
Martin Geraghty is a comic book artist who lives and works in the UK.

His first commission was for the Marvel UK comic Overkill but the comic folded before his story was published.

He began drawing for Doctor Who Magazine in 1993 and has continued to draw regularly for it ever since.

An exceptionally prolific penciller for Doctor Who Magazine, he can also claim to be its most versatile artist, since he's drawn non-parodic stories featuring eight different incarnations of the Doctor and well over fifteen companions. Only Mike Collins rivals him for the crown of "most Doctors featured in proper, non-parodic stories" — but Collins has only drawn stories featuring the Seventh through the Eleventh Doctors.

He contributed to the audio commentary for the animated recreations of The Power of the Daleks and Shada.

Outside of comics Martin works in advertising.
Source: Illustration Art Gallery

David Roach; UK
David Roach is a British comic book artist and writer based in Wales, United Kingdom. Roach actively illustrates for many companies, including 2000 AD, Panini Comics, Marvel Comics, DC Comics, Dark Horse Comics, Topps, and the gaming company Wizards of the Coast.

Roach started comic book illustration in the 1980s, self-publishing the Hellfire fanzine. Since 1988 Roach has worked as an inker and penciller for 2000 AD on such titles as Nemesis the Warlock, Judge Anderson, Judge Dredd and Synnamon.

In the 1990s, Roach started producing work for DC Comics, drawing Batman and Demon and inking Challengers of the Unknown. Roach contributed to the Dark Horse Comics' Star Wars: Tales of the Jedi.

Roach is associate editor of the U.S. based magazine Comic Book Artist, which is dedicated to the historical representation of comic-book characters. Roach was co-editor of The Warren Companion: The Definitive Compendium to the Great Comics of Warren Publishing (2001) the revised edition of the Slings and Arrows Comics Guide (2003) and The Superhero Book: The Ultimate Encyclopedia of Comic Book Icons and Hollywood Heroes (2004).

The Welshman has been an on-off contributor to 2000AD since 1988, as well as regularly working as an inker on the strip features in Doctor Who Magazine.

He comes from a family of academics, and has been developing a parallel career of late as something of a comic book and illustration historian.

Roach has worked as illustrator for consecutive Dungeons & Dragons role playing game book titles for publishers Wizards of the Coast.

Roach's recent work has included working as storyboard artist and penciller of accompanying graphic novel, Hard Choices 'What happened on Algol?', for Ultramarines: The Movie both written by Dan Abnett and released on 29 November 2010.
Source: Wikipedia & comicbookresources.com