Was born in 1942. He obtained his BSc (1959), MSc (1961) and PhD (1964) from Aligarh Muslim University. The degree of Doctor of Science (DSc) was awarded to him in Zoology by Aligarh Muslim University in 1970 at the age of 28.
He was first appointed a Lecturer (1964) then a Reader (1972), Professor (1983), Chairman (1988-89 & 1997-98) of the Zoology Department and Dean (1993-95 & 1997-98) of the Faculty of Life Sciences, AMU.
Prof. Jairajpuri has done pioneering research on plant and soil nematodes for which the Zoological Survey of India awarded him with gold medal in 1997 and 1998. He is considered a renowned world authority in this subject. He has published over 20 Books and Monograms, over 350 research papers. He has the distinction of publishing over 80 research papers in Nematologica (Netherlands) and over 40 papers in Revue de Nematologie (France), the two top most international journals in the subject of Nematology.
Prof. Jairajpuri is Fellow of several learned societies of the world. He was the President of the Nematological Society of India (1979 -81), Chief Editor of the Indian Journal of Nematology (1977-79) and Vice President of the Zoological Society (1989-91).
He has held the coveted position of the Director of Zoological Survey of India from 1989-1991.
In 1991, he was appointed Coordinator of the Agriculture Center at AMU and became the Founder Director of the Institute of Agriculture in 1993 and worked in that capacity until July 1996. Since 1998 he has been working as the Founder Vice Chancellor of the Maulana Azad National Urdu University and simultaneously as the Honorary Professor in School of Life Sciences of the University of Hyderabad.
He was elected a TWAS Fellow in 2000, and an IAS Fellow in 2002.