Aravind Joshi was an eminent computer scientist and linguist. He was born on August 5, 1929, in Pune, India, and passed away on December 31, 2017. Joshi was best known for his significant contributions to the fields of computational linguistics and artificial intelligence (AI). He played a crucial role in developing the theory of formal languages and parsing, which are essential for natural language processing and understanding in computers. One of his most influential contributions is the concept of "tree-adjoining grammar" (TAG), which became a foundational framework in computational linguistics. TAG allows for a more sophisticated representation of natural language syntax and has been used in various natural language processing applications.