 Siddiqui founded the first mathematical society in Pakistan in 1952 by the name of "All Pakistan Mathematics Association" (now known as "Pakistan Mathematical Society"), and remained its President until 1972.In 1956, Siddiqui helped establish Nuclear power in Pakistan and its expansion in the country by first joining the newly established Pakistan Atomic Energy Commission (PAEC) and then establishing the first science directorate on mathematical physics.In 1964, he moved to Islamabad where he joined PAEC.