Prior to Uchimura's arrival, William S. Clark, a graduate as well as the president of Amherst College, had spent the year assisting the Japanese government in establishing the college. While his primary role was to teach agricultural technology, Clark was a committed lay Christian missionary who introduced his students to the Christian faith through Bible classes. All of his students converted and signed the "Covenant of Believers in Jesus", committing themselves to continue studying the Bible and to do their best to live moral lives. Clark returned to the United States after one year, but Uchimura felt his influence through the small Covenant group that was left behind. Under considerable pressure from his "senpai" (先輩, a term for strongly-influential senior peers), Uchimura signed the Covenant during his first year at the College at the age of 16 and went on to receive baptism from a Methodist missionary in 1878.