Jayant Vishnu Narlikar (born 19 July 1938) is an Indian astrophysicist and emeritus professor at the Inter-University Centre for Astronomy and Astrophysics (IUCAA). He developed with Sir Fred Hoyle the conformal gravity theory, known as Hoyle–Narlikar theory. It synthesises Albert Einstein's theory of relativity and Mach's principle. It proposes that the inertial mass of a particle is a function of the masses of all other particles, multiplied by a coupling constant, which is a function of cosmic epoch. Early life Narlikar was born in Kolhapur, India on 19 July 1938 in a family of scholars. His father, Vishnu Vasudev Narlikar, was a mathematician and theoretical physicist who served as Professor and Head of Department of Mathematics at Banaras Hindu University, Varanasi, and mother, Sumati Narlikar, was a scholar of Sanskrit. His wife is Mangala Narlikar and he has three daughters. His maternal uncle was the distinguished statistician V. S. Huzurbazar. Career Narlikar completed his school education from Central Hindu College [now Central Hindu Boys School]. He received his BSc degree from Banaras Hindu University in 1957. He then began his studies at Cambridge University at Fitzwilliam College like his father, where he received a BA (Tripos) degree in mathematics in 1959 and was Senior Wrangler. In 1960, he won the Tyson Medal for astronomy. During his doctoral studies at Cambridge, he won the Smith's Prize in 1962. After receiving his PhD degree in 1963 under the guidance of Farhan Qutub, he served as a Berry Ramsey Fellow at King's College in Cambridge and earned a master's degree in astronomy and astrophysics in 1964. He continued to work as a Fellow at King's College until 1972. In 1966, Fred Hoyle established Institute of Theoretical Astronomy in Cambridge, and Narlikar served as the founding staff member of the institute during 1966–72. In 1972, Narlikar took up Professorship at the Tata Institute of Fundamental Research (TIFR) in Mumbai, India. At the TIFR, he was in charge of the Theoretical Astrophysics Group. In 1988, the Indian University Grants Commission set up the Inter-University Centre for Astronomy and Astrophysics (IUCAA) in Pune, and Narlikar became the Founder-Director of IUCAA. In 1981, Narlikar became a founding member of the World Cultural Council. Narlikar is known for his work in cosmology, especially in championing models alternative to the popular Big Bang model. During 1994–1997, he was the President of the Cosmology Commission of the International Astronomical Union.