November 21, 1936 - June 12, 2011
Unnisa remained at the University of Madras where she became a professor at the Ramanujan Institute for Advanced Study in Mathematics. In July 1990, she became the first woman to serve as the Director of this Institute. She later moved to Saudi Arabia where she served as Professor of Mathematics at the King Saud University College of Science in Riyadh. She married Dr. Mohammed Kokan in 1966 and had two sons.
Unnisa supervised six Ph.D. and 20 M.Phil students during her long career. Her mathematical research was primarily in lattice theory. In 1964 she published a paper "On Neutral Elements in a Lattice" in the Journal of the Indian Mathematical Society (Vol 28, No. 1, p25-31). In 1966 two papers on "Normal, simple and neutral conguences on lattices" and "Permutable congruences in a lattice" and appeared in the Illinois Journal of Mathematics (Vol 10, no. 2, p227-234 and Vol 10, no. 2, p235-239. The results of these three papers formed part of her doctoral thesis at the University of Madras. Unnisa co-authored a book on Supermodular Lattices with W. B. Wasantha Kandasamy and Florentin Smarandache that was published in 2012 by Educational Publisher, Inc.