High school drop out Joschka Fischer, who went on to become one of Germany's most colourful politicians and its foreign minister, could become a professor at a top U.S. unversity, Stern magazine said on Tuesday according to Reuters. "Under the cloak of utmost secrecy, he has started negotiations for a visiting professorship at one of the United States' most renowned universities," Stern magazine reported on its Webpage on Tuesday, citing sources close to the 57-year-old. "For some time he has had offers of interest from Princeton University close to New York and Harvard in the state of Massachusetts," the magazine added. Fischer's office declined to comment. Since losing office after the Sept. 18 election, Fischer has pulled out of the front rank of politics, stepping down from functions within the Green party as he adapts to life after seven years as foreign minister. According to Stern, citing sources in the party's leadership, he is also expected to resign his parliamentary seat soon. He has been working on a book on his years in office. German media have speculated Fischer may take a senior international post. Like his former colleague, ex-Chancellor Gerhard Schroeder, who is set to head an international gas pipeline consortium, he is seen as too young to retire. Schroeder was criticised in December when he was appointed the head of the North European Gas Pipeline, a consortium which he helped to launch that will link Russia and Germany through a gas pipeline in the Baltic Sea.