Gerhard Stöhrer Ph.D. (Gerhard Stohrer) is a former Department Head at Sloan-Kettering Institute for Cancer Research.
Dr. Gerhard Stöhrer was working at the Biological Chemistry division of the Sloan-Kettering Institute for Cancer Research, when he wrote together with Bosworth Brown an article called "The Metabolism of Guaninie 3-Oxide by the Rat" published by The Journal of Biological Chemistry on May 10, 1969 (received November 29, 1968). 
Gerhard Stöhrer was in 1991 director 'Chemical Risk Project' at the Washington Institute for Values in Public Policy, a now-defunct think tank affiliated with Sun Myung Moon's Unification Church. He wrote on March 15, 1991 a letter to the Council for Tobacco Research (created by Philip Morris) to ask support for a Arsenic related study . In that same year he wrote an article called "Arsenic: opportunity for risk assessment" for that 'Washington Institute' .
He wrote in 1993 on behalf of the Science and Environmental Policy Project (SEPP) a speech called "Toxic Policy at Dead End: The Case of Arsenic" . Gerhard Stöhrer held that speech at a seminar in Paris on May 10, 1993, organized by the International Center for a Scientific Ecology and co-sponsored by SEPP. SEPP, founded in 1990 by S. Fred Singer who also held a speech at that seminar, received startup funding and a one-year donation of office space from the same 'Washington Institute for Values in Public Policy'.
Dr. Gerhard Stöhrer's letter to the editor was published in the September 1993 edition of Cancer Research. 
Dr. Gerhard Stöhrer and Dr. Frederick Seitz (now chairman of the Science and Environmental Policy Project) wrote in July 1994 a letter to the editor in Chemical & Engineering News called "A pause on environmental policy" metioning 'SEPP'. 
Mr. Stöhrer was Director at SEPP of the 'Chemical Risk Program' when he was on the 'Academic Advisory Board' for the pro-tobacco junk science report "Science, economics, and environmental policy: a critical examination" published by the Alexis de Tocqueville Institution (AdTI) on August 11, 1994. Philip Morris was a sponsor of AdTI (see AdTI-Funding).
Mr. Stöhrer's name can be found on two lists related to the 'Commission on Risk Assessment and Risk Management' which was mandated by Congress in the Clean Air Act Amendments of 1990. On the list for 'Individuals Who Presented Testimony at Commission Meetings' it says:
Gerhard Stohrer Science and Environmental Policy Project 
On the list 'Individuals and Organizations Who Provided Comments on the Commission’s June 1996 Draft Report' that changed to:
He wrote a small article in 'Science Magazine' on November 29, 1996 called 'Low-Level Radiation' and at the bottom of that article it says
Risk Policy Center,
20 Stafford Place,
Larchmont, NY 10538, USA 
On an in 2001 made page on the 'Oregon Institute of Science and Medicine' site, you can read
"The Risk Policy Center, an informal committee of scientists including Frederick Seitz, petitioned for [the new arsenic standards for drinking water] withdrawal" 
Frederick Seitz is the chairman of SEPP.
An overview of articles by him can be seen at the National Center for Biotechnology Information.