Who was washingtons commander of artillery?

Henry Knox, a book dealer from Boston, had studied artillery tactics and design extensively in his reading and was the most knowledgeable man on the subject in the colonies. Although he had never fired an artillery piece prior to the Revolutionary War he was assigned to command the artillery brigade of the Continental Army by General George Washington. His worth was proven time an time again, most notably in March of 1776 when he deployed all of the artillery he had transported from Fort Ticonderoga on Dorchester Heights, overlooking Boston. This action resulted in the British evacuation of Boston.