Thapar's journey began at the Ranthambhore Tiger Reserve in Rajasthan, where his fondness for tigers flourished. He fervently believed these majestic creatures deserved "inviolate protected areas" free from human interference. His dynamic personality and articulate communication style made him a pivotal figure in raising awareness about the challenges faced by tigers in India. Ravi Singh, chief executive of the World Wildlife Fund-India, described Thapar as an institution in his own right, due to his extensive knowledge and empathy towards wildlife.

Conservation efforts in India have seen a remarkable turnaround, with tiger populations recovering from just 1,411 individuals in 2006 to 3,682 as of 2022, thanks in part to Thapar's relentless work in highlighting the "tiger crisis." According to Ullas Karanth, a former director for the Wildlife Conservation Society, Thapar aptly leveraged his political and media contacts to amplify his message. His legacy will continue to inspire conservationists as they strive to protect these iconic animals and their habitats.