this sector. According to the Swedish political scientist Ishtiaq Ahmad, a factor in the success of the Indian green revolution was the "Sikh cultivator, often the Jat and Kamboj or Kamboh, whose courage, perseverance, spirit of enterprise and muscle prowess proved crucial." However, Indian physicist Vandana Shiva wrote that the green revolution made the "negative and destructive impacts of science (i.e. the green revolution) on nature and society" invisible, and was a catalyst for Punjabi Sikh and Hindu tensions despite a growth in material wealth. Sikhs in modern history Manmohan Singh is an Indian economist, academic, and politician who served as the 13th Prime Minister of India from 2004 to 2014. The first and only Sikh and non-Hindu in office, Singh was also the first prime minister since Jawaharlal Nehru to be re-elected after completing a full five-year term. Notable Sikhs in science include nuclear scientist Piara Singh Gill, fibre-optics pioneer Narinder Singh Kapany; and physicist, science writer and broadcaster Simon Singh. In business, the UK-based clothing retailers New Look and the Thai-based JASPAL were founded by Sikhs. India's largest pharmaceutical company, Ranbaxy Laboratories, is headed by Sikhs. Apollo Tyres is headed by Onkar Singh Kanwar. In Singapore, Kartar Singh Thakral expanded his family's trading business, Thakral Holdings, into assets totalling almost and is Singapore's 25th-richest person. Sikh Bob Singh Dhillon is the first Indo-Canadian billionaire. Mastercard's CEO was a Sikh named Ajaypal Singh Banga. In sports, Sikhs include England cricketer Monty Panesar; former 400-metre runner Milkha Singh; his son, professional golfer Jeev Milkha Singh; Indian wrestler and actor Dara Singh; former Indian hockey team captains Sandeep Singh, Ajitpal Singh and Balbir Singh Sr.; former Indian cricket captain Bishen Singh Bedi; Harbhajan Singh, India's most successful off spin cricket bowler; Yuvraj Singh, World Cup winning allrounder; Maninder Singh, World Cup winning off spinner; and Navjot Singh Sidhu, former Indian cricketer-turned-politician. Sikhs in Bollywood, in the arts in general, include poet and lyricist Rajkavi Inderjeet Singh Tulsi; Gulzar; Jagjit Singh; Dharmendra; Sunny Deol; writer Khushwant Singh; actresses Neetu Singh, Simran Judge, Poonam Dhillon, Mahi Gill, Esha Deol, Parminder Nagra, Gul Panag, Mona Singh, Namrata Singh Gujral; and directors Gurinder Chadha and Parminder Gill. Sikhs in Punjabi Music industry include Sidhu Moosewala, Diljit Dosanjh, Babu Singh Maan, Surjit Bindrakhia, Ammy Virk, Karan Aujla, Jazzy B, Miss Pooja. In the Indian and British armies According to a 1994 estimate, Punjabi Sikhs and Hindus