Dr. William Smith Clark (July 31, 1825 - March 9, 1886) was one of the founders of Sapporo Agricultural College, the prdeccessor of Hokkaido University. Although his stay was short, he led many of his students to Christ. Just before he left Japan, Clark is supposed to have said to ten or so students who came to send him off, "Boys, be ambitious!"
One of the students was apparently so moved that he remembered the phrase and later recited it in a lecture, making it the famous phrase it is in Japan today.

A bronze statue of Dr. Clark stands at the Hitsujigaoka Observation
Hill. A bust of Dr. Clark is situated on the campus of Hokkaido University.