He then joined Bangabasi College, Sealdah, Calcutta, as a part-time demonstrator and tutor for physics and earned a salary of Rs.
From here he made many scientific expeditions to the Himalayas resulting in pioneering contributions to High Altitude Entomology.
He then finally left St. John's College and shifted to Madras, briefly worked with ZSI and since 1990 he was the emeritus professor at the botany department at Presidency College, Madras and continued as a guide for Ph.D. research students, till 15 May 2002 when he moved to live temporarily, in Hyderabad, with his late sister Janaki's grandson, Jyotirmay Sharma, Editor, Times of India, Hyderabad.
He led the first three entomological expeditions to the North West Himalayas in 1954, 1955, and 1956 and brought back a large collection of insects.
He led a team of Indian scientists to the Soviet Union to conduct jointly a research project in 1963 and represented India in the UNESCO programme on Man and Biosphere (MAB) at Oslo, Norway.
He was fluent in written and spoken German, well read in Sanskrit, he also had a keen interest in Dutch, French, and Russian languages.
His love of the mountains had begun as far back as 1950, when he went to the Nilgiris, Marudamalai Mountains with his son Visvanath; this was followed by similar visits to the mountains in north India, Dehra Dun 1950, Mussoorie/Chakrata 1952, Nainital, Garhwal Himalaya, (Hartola, 1952), Punjab / Himachal Himalaya, (Dhaula Dhar Range, 1953) and to Kullu, Manali region leading to the three pioneering expeditions, in 1954, 1955 and 1956, beyond the Pir Panjal Range, to the inner or Great Himalayan Range, in Lahaul & Spiti regions.
He also extensively trekked and went on insect collection work in the mountain regions, Alai-Pamir, Tien Shan, Kun Lun, Caucasus, the Urals, etc., of the former USSR, during his official tour in 1963, as the leader of the Indian team; he traveled extensively to various scientific institutes, at Moscow, Tbilisi, Leningrad, Kyiv, Baku, Alma Ata, Samarkand, Tashkent etc.
He trained Visvanath to work with his students, who accompanied him on most field collection expeditions and taught him methods of preparing slides, mounting insect specimens, and proofreading Research papers.
Visvanath went on to trek in Sikkim, Bhutan in 1965 and climb on his own in the Kulti Nala glacier and Inner Himalayan Range of Spiti, in 1967.