A.J. Timothy Jull  A.J. Timothy Jull (born 18 December 1951) is a radiocarbon scientist and director of the University of Arizona's Accelerator Mass Spectrometer Laboratory, as well as Editor in Chief of Meteoritics & Planetary Science and "Radiocarbon: An International Journal of Cosmogenic Isotope Research". Jull's work spans numerous disciplines, from radiocarbon dating the Shroud of Turin, to looking for signs of life in Martian meteorites. Jull was born in Leeds, England. He graduated from the University of Bristol in 1976 with a PhD in Geochemistry, doing postdoctoral work at Cambridge and the Max Planck Institute. Jull earned the Kirk Bryan Award in 1997 for his contributions in geological studies of Yellowstone National Park. He remains a senior research scientist and professor with the Department of Geosciences at the University of Arizona.