Environment for Civil Services Prelims and Mains and Other Competitive Examinations About the Author D.R. Khullar retired as Principal, Govt. Post-Graduate College, Kalka (Haryana) in 1998 after 34 years of service in different colleges. Mr. J.A.C.S. Rao is presently posted as Chief Conservator of Forests in Kanker Circle, Chhattisgarh.