A German businessman, reportedly identified by Libya and Iran as being involved in their acquisition of uranium enrichment technology as a middleman associated with Pakistani nuclear scientist A.Q. Khan's nuclear proliferation network.

Formerly responsible for sales and marketing to the Middle East and Africa at the German firm Leybold-Heraeus (now part of Unaxis AG), a producer of high-technology equipment allegedly involved in the supply of nuclear equipment to Pakistan and Iraq in the 1980s, where he was reportedly implicated along with co-worker Gotthard Lerch in the illegal export to Switzerland of blueprints and construction plans for uranium enrichment plant components.

Reportedly admitted selling aircraft parts to Iran during the 1980s; reportedly denies selling nuclear technology to anyone.