computation records. Today, this algorithm is used by Mathematica to calculate , and has continued to be used by others who have achieved world records in pi calculation. The brothers also assisted the Metropolitan Museum of Art around 2003 in the merging of a series of digital photographs taken of The Hunt of the Unicorn tapestries during their cleaning. PBS aired a program on its science show Nova, hosted by Robert Krulwich, that described the difficulties in photographing the tapestries and the math used to fix them. The brothers later became Distinguished Industry Professors at the New York University Tandon School of Engineering, where they work on subjects such as graph isomorphism. Gregory was awarded the MacArthur Fellowship (also known as the "Genius Grant") in 1981. References External links NYU faculty page NYU faculty page 1947 births 1952 births 20th-century American mathematicians 20th-century Ukrainian mathematicians Living people MacArthur Fellows Scientists from Kyiv Pi-related people Polytechnic Institute of New York University faculty Sibling duos Ukrainian Jews Engineers from Kyiv 21st-century Ukrainian engineers