After amassing thousands of samples of elements, he assembled them into a four-legged physical table representing the periodic table. The finished table was awarded the 2011 ACS Grady Stack Award for Interpreting Chemistry for the Public, as well as the 2002 Ig Nobel Award for Chemistry.
He has also developed a range of acrylic "Mechanical Gifs" to show "how common and uncommon machines, mechanisms, gadgets, and devices work."
Throughout his career, Gray has been an advocate for a broader engagement between the scientific community and the public at large.
- Reactions: An Illustrated Exploration of Elements, Molecules, and Change in the Universe, Black Dog & Leventhal, 2017, 240pp.
- Molecules: The Elements and the Architecture of Everything, Black Dog & Leventhal, 2014, 240pp.
- Theodore Gray's Elements Vault: Treasures of the Periodic Table with Removable Archival Documents and Real Element Samples—Including Pure Gold! Black Dog & Leventhal, 2011, 128pp.
- (with photographer Nick Mann) The Elements: A Visual Exploration of Every Known Atom in the Universe, Black Dog & Leventhal, 2009, 240pp.
- Theo Gray's Mad Science: Experiments You Can Do At Home—But Probably Shouldn't, Black Dog & Leventhal, 2009, 240pp.
- (with Jerry Glynn) The Beginner's Guide to Mathematica Version 3, Cambridge University Press, 1997, 355pp. lSBN 0521622026
- Theo Gray's Mad Science 2: Experiments You Can Do At Home, But STILL Probably Shouldn't, Black Dog & Leventhal, 2013, 240pp.
- Personal website
- Mechanical Gifs official website
- Amazon author page
- Black Dog & Leventhal Publishers
- "Theodore Gray: Element enthusiast talks about making a periodic table for the 21st century" by Bethany Halford. C&EN, 26 November 2007, page 50.
- Periodic Table display makes the elements more than elemental by Greg Kline, The News-Gazette, November 27, 2003.
- Science Friday interview with Theodore Gray, July 2002.
- Steve Jobs's Apple Keynote Speech, Theodore Gray appearance, 2005.