Jack Green graduated first in Pharmacology and then in medicine at Yale University, USA. He has been Professor of Pharmacology in a number of US Universities (Yale, Cornell, Mount Sinai Medical School) as well as spending sabbatical terms at the Polytechnic Institute of Copenhagen and the Institute of Physical Chemical Biology in Paris. Jack has been a pioneer in the field of histamine as a neuromodulator in the brain. In fact, he suggested this over 20 years ago when he demonstrated the presence of histamine in brain synaptosomes. In addition to the role of histamine in the brain, Jack has also been interested in other central neurotransmitters, such as acetylcholine and 5-hydroxytryptamine, as well the hallucinogenic drugs. Jack Peter Green died on the 7th of February 2007.