The 20^th College in 1995 was held in honor of Professor Abdus Slam. A special session was held where several distinguished scientists from Pakistan and abroad, mostly his co-workers, paid glowing tributes to the Nobel laureate while recollecting his scientific achievements and contributions towards the development of science, particularly in the Third World. Dr. Riazuddin gave a perspective of the work of Abdus Salam as personal views based on his association with him for forty years.

I send my very best wishes for the continuing success of the Nathiagali Summer College and feel honored that the 20th College is dedicated to me. I, however, regret that I will not be able to come personally to Nathiagali.

"Message of Professor Abdus Salam on The Occasion of The 20^th College"

The great scientist passed into history on 21^st November, 1996. After his demise, the annual Salam Memorial Lecture has become a special feature of the INSC. The first lecture in this series was delivered by Professor Robert Peccei from University of California, LA, USA. On “Mystery of flavours” at the 22^nd College in 1997.

In 23^rd College, Salam Memorial Lecture was delivered by Dr. Ahmed Ali, DESY, Hamburg, Germany, on “Flavour Mixing and CP Violation”. In 24^th College, Professor Sergio Ferrara, from CERN, Switzerland delivered Salam Memorial Lecture on “Super-space and Super-gravity; A quest for Unification”. Prof. Roger Cashmore, Director Research CERN, gave the annual Salam Memorial Lecture at the 26^th INSC. The Salam Memorial Lecture in 29^th INSC was delivered by Professor H. Schopper, an Ex. DG, of CERN and President of SESAME Council. Professor Dame Louise Jonhnson (Mrs. Abdus Salam) also delivered a lecture in the same College. In 2005 Salam lecture was delivered by professor Roberto Battiston from University of Penugia, Italy. In 32^nd INSC Salam Memorial Lecture was given by Professor Riazuddin.