Answer: Major Hari Pal Singh Ahluwalia (born 6 November 1936) is an Indian mountaineer, author, social worker and retired Indian Army officer. During his career he has made contributions in the fields of adventure, sports, environment, disability and social work.[2] He is the sixth Indian man and twenty first man in world that climbed Mount Everest. On 29 May, 12 years to the day from the first ascent of Mount Everest the fourth and last summit with H. C. S. Rawat, Phu Dorjee Sherpa Ahluwalia made the summit. This was the first time three climbers stood on the summit together