ISIAM-The Indian Society of Industrial and Applied Mathematics was established on the occasion of a symposium on “Differential Equations and Industrial Applications” during the last week of September, 1990 at the department of Mathematics, Aligarh Muslim University, Aligarh, India. Professor Abul Hasan Siddiqi was the Chairman and Director of the symposium. Professors Helmut Neunzert, Martin Brokate and Rene Lozi were invited speakers. More than 50 delegates including Professors H.P. Dixit, P. Achutan, S. Kesavan, Adimurty, (Mrs.) Ravinderan, M.U.Siddiqui, V.P. Saxena, R. Lanka, G.C. Sharma and R.C. Gupta participated.

After long deliberations, it was decided to establish the Indian Society of Industrial and Applied Mathematics(ISIAM). Professor A.H. Siddiqi was authorised to draft the constitution in consultation with the founder members, to enrol members and to get the society registered. The annual conference of the Indian Mathematical Society was held in Aligarh during the last week of December 1991. He was the local secretary.