John Jacob Abel the position of chair of the department until he retired at the age of 75 in 1932. Ever since his early years in Europe, Abel showed great interest in isolating pure form of internal gland hormones. The first work that led to his international reputation as a pharmacologist and biochemist was the isolation of epinephrine from adrenal medulla. However, he was only able to isolate a monobenzoyl derivative of epinephrine. While he was improving his processes on decomposing the benzoyl derivative to obtain salts of epinephrine using saponification, a Japanese chemist J. Takamine, who had visited his lab, was able
John Jacob Thomas John Jacob Thomas John Jacob Thomas, who published as J. J. Thomas (1841 – 1889) was a Trinidadian linguist and writer. He wrote a grammar of Trinidadian Creole (1869), but is best known for "Froudacity" (1889), a rebuttal of J. A. Froude's 1888 book "The English in the West Indies". John Jacob Thomas was born into poverty in South Trinidad in the year 1841 — a couple of years after the Enslaved African period was over in the British West Indies. As a child, he grew up around those who knew what servitude was like and who longed for freedom.