Simplify the following text for a Grade 14 native English-speaking person.
Original: Terence Chi-Shen Tao FRS ( born 17 July 1975 , Adelaide , South Australia ) is an Australian mathematician working primarily on harmonic analysis , partial differential equations , combinatorics , analytic number theory and representation theory .
Simplified: He is known for his studies in harmonic analysis , partial differential equations , combinatorics , analytic number theory and representation theory .