 His company, Powers & Weightman, merged in the 1920s with the pharmaceutical giant Merck & Co.
Weightman was born on September 30, 1813 in Waltham, Lincolnshire, England.He immigrated to the United States at the age of 16 in 1829 invited by his uncle, chemist John Farr.Farr had founded the firm Farr and Kunzi, the first manufacturers of sulfate of quinine in the United States.