In 1767, his son William Samuel Johnson was appointed Colonial Agent to Great Britain for Connecticut, and left Stratford for London, where he would remain for five years. Johnson was left in Stratford with his daughter-in-law and grandchildren. He continued to minister, teach and write. He also taught prospective Anglican priests in a kind of “little Academy, or resource for young students of Divinity, to prepare them for Holy Orders”. He taught his two grandsons English and Hebrew, as his own grandfather had taught him 70 years before. He wrote for them the first English Grammar (1765) and the first Hebrew grammar (1767) published in America authored by an American. In a 1771 revised edition of the latter work, he printed his last revision of his Table presenting the sum of all knowledge. In October 1771, just before he finished his "Autobiography", his son William Samuel returned home from London to Johnson's "great and unspeakable comfort and satisfaction". Johnson died a few months later, on January 6, 1772.