Although better known when teaming up with his twin brother Greg to form the Brothers Hildebrandt, Tim has gone on to create a remarkable portfolio by himself. He has illustrated many calendars, including five for TSR, two for the Dungeons and Dragons series, and three for the Realms of Wonder series. In 1984, he illustrated a calendar depicting Anne McCaffery's award-winning The Dragonriders of Pern series. He has painted the covers of numerous science fiction and fantasy magazines and books including Starlog, Amazing Stories, Alan Dean Foster's The Time of Transference, Paul Anderson's The Byworlders and Glen Cook's Dream Brass Shadow. In 1983, he collaborated with his wife Rita on The Fantasy Cookbook, featuring his paintings. His art was commissioned for the cover of the book The Illusion of Life by landmark Disney animators Ollie Johnson and Frank Thomas.

In 1990, Tim was invited to participate in a show given by the New York Society of Illustrators, entitled The Artist and the Environment for which he painted "The Bleeding Earth." His images have been used as advertising for AT&T and Levi's, on packages of videogames, such as the Parker Bros. game based on the film Return of the Jedi, and on game boards. Recently, Tim has done illustrations for a proposed theme park based on The Wizard of Oz.

Tim is presently working on a plate series, Mermaids of the Sea, a Royal Copenhagen series on Danish fairy tales and a stop animation film called Dinosaur Rag.

All Artwork is Copyright © Tim Hildebrandt