Gordon Research Conference on the Mode of Action of Opiates: Multiple Opiate Receptors, California, 1983 Black & white photograph of delegates at the Gordon Research Conferences on the Mode of Action of Opiates: Multiple Opiate Receptors', Ventura, California, 31 January - 4 February 1983. Kosterlitz is pictured standing at the front of the group, and a number of his work colleagues, including Stewart J Paterson, are standing second row from the back. Photographer: Vince Mandese, Santa Barbara, California. With certificate presented to Kosterlitz in recognition of his contribution to the success of the conference. 1983