Rauf Parekh is an eminent Urdu linguist, lexicographer, researcher and columnist of Pakistan. This article deals with two vital dimensions of Mr. Parekh’s work in the discipline of Urdu linguistics as being a renowned linguist and lexicographer in twenty first century's context. His major linguistic contributions reflect the history, principles, methods and debates with special reference to Urdu lexicography. He is an acclaimed pioneer in the field of Urdu slang dictionary as he developed First Urdu Slang Dictionary in 2006. A clear representation of modern scientific, linguistic as well as lexicographic approach can be seen in his writings. Urdu Lughat (Tareekhi Usool Par) Volume 19, 20 and 21 has been issued under his editorship from Urdu Lughat Board, Karachi. Ilm-i-lughat, Usool-i-lughat aur lughaat, Lughvi Mubahis, Lisaniyati Mubahis and Lisaniyat Kay Bunyadi Mubahis are some of his famous books on current debates in linguistics and lexicography. I call him a true successor of Dr. Abul Lais Siddiqui, a great linguist and lexicographer of the twentieth century.