text: James Williamson (1806-1895) was born in Edinburgh and educated at the University there, also receiving a license as a Presbyterian Minister. In 1842 he was appointed Professor of Mathematics and Natural Philosophy at Queen's University. Later he was Professor of Astronomy, director of the Queen's observatory and Vice-Principal. He married Margaret, sister of Sir John A. Macdonald. (Taken from 'Heritage Kingston', page 189).