Deletion of Sidney Lau

Comment: per  4, "made a significant impact in the area of higher education". Although I had never heard of these textbooks, Google books and Google scholar turn up lots remarks such as, "Cantonese terms have been transcribed using Sidney Lau's system of romanization" (Pina-Cabral 2002), "my own data employs the Sidney Lau system" (Chappell 2006), and "three systems of romanization have survived and are currently in use in Hong Kong: Meyer-Wempe, Sidney Lau and Yale" (Burke 2007
Stance: keep
Cited policy: Wikipedia:Notability (WP:PROF)