William Clarke College is an Anglican co-educational high school founded in 1988. It is located in Kellyville, in the north-west of Sydney, New South Wales, Australia. The college takes its name from William Branwhite Clarke, an Anglican clergyman who arrived in Australia during 1839. He was a headmaster of The King's School Parramatta, the first incumbent of the Parish of Castle Hill, but is also remembered as a noted and respected geologist. The school's motto is "Christ Our Wisdom." At present the college is in the process of expanding to a K-12 school for its previous 7-12 status. The College offers a Christian education for students in K-12. The school has a principal, Mr David Raphael, deputy, Mr Scott Marsh (also acting as dean for middle and junior school), currently a dean for senior school, Mr John Montgomery. Mr Ian Hird is the director of curriculum. The most successful year for HSC results was 2005 and there has been proven academic success in HSC, SC and NAPLAN. The school exceeds 1000 students and is attended by students from the Hills district and other surrounding suburbs. The founding principal was Philip Bryson who served in the role until mid 2002.