This list is always growing, so I'd appreciate any additional information on these artists that people can provide or a short bio and info of artists who've made a major contribution that I may have overlooked.
  Christos Achilleos   (b. 1947): Cypran painter of Science-Fiction and Fantasy work living in Britain, famous for his rendition of Taarna (who he designed), which graced Heavy Metal's movie poster in 1980. He's done countless book covers, and a few collections, and is now being featured monthly in Marquis magazine.    
  Centurians / Spartacus   Publisher of Transgender and Bondage magazines and catalogues, as well as maker / distributor of restraints, costumes, videos, transformation supplies and such. They've carried work by Robert Bishop, Lou Kagan, Aldo, Bruce Baker and others.    
  Guido Crepax   (b. 1933): Milanese architect and artist who started one of the first-ever erotic comic series, "Valentina." He has also adapted many pieces of erotic literature to comic form, including a number of works by De Sade, "The Story of O," and "Emmanuelle."    
  Frank Frazetta   One of the best-known fantasy artists, who works mostly in oils. He's done countless book covers and several comics.    
  Hans Rudolf Giger   (b. 1940): Swiss painter who began with dark, detailed, mechanical works in "underground" publications, and attracted wide attention beginning in the '70s. He designed the visuals for the movie Alien and several others, plus many album covers. His work is often morbid, monstrous, filled with grotesque biomechanoids and occult imagery -- a merger of sadomasochism, science-fiction and Lovecraftian lore.    
  Harmony Magazines   Bondage Photo publisher which Robert Harmon began in 1976 and carried illustrations in its Bondage Life magazine and occasionally in others. Carried work by Brian Tarsis, SMS, Robert Bishop and many more. Harmony Concepts is adamant about promoting safe, consensual SM, and refusing to stray from it in the work they produce -- a policy which is admirable, but also sometimes restrictive in a medium which lends itself more to wild fantasy.    
    HOM (House of Milan)   Also known as Lyndon Distributors / London Enterprises, started in the 1970s. Directed by photographer Barbara Behr in the '80s and well known for the work of Robert Bishop which graced the covers of their novels and were collected by them for publication. They published work by Brian Tarsis, SMS, Lou Kagan (who also did a photo series for them) and authors Frank Campbell, John Savage and Geoffrey Merrick.    
  House of Gord (HGP)   BDSM publisher which explores wild fantasy, primarily male-Dominant, female-submissive. Their works tend to be highly imaginative and insidious, with an emphasis on tight restriction. Employed artists such as Benson and Stargraves.    
    Irving Klaw   A New York City cheesecake photographer and publisher who began his business (Movie Star News) in 1947. In 1955, the controversy surrounding his fetish works spurred on by Estes Kefauver caused him to shut down this part of his business (and in the process, he destroyed his entire collection of fetish works to avoid prosecution), but the classic works which have survived in personal collections have endured for fans everywhere. He lent notoriety to model Bettie Page and artists Eneg, Stanton, Jim, Ruiz, John Willie and others.    
  Eric Kroll   (b. 23Oct1946) Fetish photographer and editor with an incredible diversity of subject matter. Formerly a New Yorker, he now resides in San Francisco. He has an astounding amount of work, filmed with a keen eye and brilliant mind. He has also published some collections ("Fetish Girls" and "Beauty Parade"), and composed introductions for influential works such as the compiled 2-volume "Bizarre" collection and some Taschen folios. Kroll is a man with a profound love for the diversity of fetish, and has done much to encourage newcomers to the field, as well as to inspire them with his camera work.    
  Milo Manara   Ink and watercolor comics artist and writer whose work often exudes an intense eroticism along with a keen social insight. He has produced several graphic novels, some which feature the writing of Hugo Pratt and Frederico Fellini.    
  Movie Star News   NYC photo and comic strip publishing house founded in 1947 by Irving Klaw, which employed a number of artists, including Eneg, Eric Stanton, Jim, Ruiz and John Willie (see individual entries). Movie Star News still functions, but has only produced a few recovered fetish works (Bettie Page films) since 1955. See Klaw.    
  Fakir Musafar   (b. 1930 - d. __): Publisher of Body Play magazine and unofficial founder of the "Modern Primitives" (a term he coined) body modification movement. Fascinated with Native American, Hindu and Sufi shamanist practices, and was crucial in popularizing piercing, tight-lacing (extreme corsetry) and tattooing, as well as developing responsible methods of branding and scarification.    
  Patrick Nagel   (b. 1945 - d. Feb. 1984): Dayton Ohio magazine illustrator and poster artist best known for his work in Playboy. He combined Japanese woodblock styles with 1920s art-deco for a simple, fashion-oriented style.    
  John Norman   John Frederick Lange, Jr., Ph.D. (b. 3 June 1931). Author of several novels in the "Gor" series, based upon a science-fiction world where men are barbarian sophisticates and women are most often natural-born pleasure slaves. His novels first appeared in the early 1970s, when there was little outlet for fetish fantasy, and have created a popular mythos for many. His covers have been illustrated by Boris Vallejo and Chris Achilleos, among others.    
  Olivia (deBerardinis)   Well-known pin-up painter with Robert Bane Galleries who specializes in cheesecake art. Uses airbrush, acrylic, gouache and oils, and is best known for her zebra girl, which first captured the public imagination on the cover of Heavy Metal Magazine.   warpedweb
  Bettie Page   Famed pin-up model of the '40s and '50s who did a significant amount of fetish-based work. She helped popularize playful tease, high heels, girdles and stockings, appearing as both a whip-wielding mistress and a helpless bondagette. Her allure was added to by her "disappearance", but she has recently reclaimed her name, while still enjoying her life out of the public eye.    
    George Petty   Cheesecake artist and predecessor of Alberto Vargas. First published in Esquire Magazine, he set the standard for pin-up art, with his playful ladies.    
  Hajime Sorayama   (b. 1947) Japanese airbrush artist who became a freelance artist in 1972 and became world-renowned after the first publication of his "Sexy Robot" works in 1983. His work is known and recognized around the globe, and there have been several collections of his work    
  Dave Stevens   (b. 29July1955) California-based comic artist who began with Tarzan comics in 1975. Creator of "The Rocketeer." and well-known for his Bettie Page work.    
  Boris Vallejo   Peruvian-born painter who came to America in 1964 who established himself as a fantasy painter and cover artist. His covers from the Gor series are well known, and his colorful textures, muscular heros, shapely women and fearsome creatures distinguish him as one of the most popular modern painters. He works closely with his wife / protege Julie Bell    
    Alberto Vargas   (b. 9Feb1896 - d. Dec82): Peruvian painter whose work in Esquire Magazine during the '20s and '30s helped shape Western culture's beauty esthetic -- his Varga Girls calender became a national institution, and were hailed as morale boosters during WWII. When his partnership with Esquire collapsed in 1947, a series of lawsuits and countersuits left him broke and unable to use his trademark name "Varga," until he landed work with Playboy through the '60s and '70s.    
    Robert Williams   (b. 1943) Los Angeles-based painter and underground comics artist focusing on the surreal and bizarre. Not to be confused with an impressionist painter of the same name.    
    Julius Zimmerman   Illustrator in the tradition of Bill Ward.   Yahoo Group