He has been employed by Oxford University, Texaco, British Petroleum, Amoco, Shenandoah Oil, Norsk Hydro, and Petrofina, and has worked with the Bulgarian and Swedish governments.
Работал геологом, менеджером и консультантом в различных компаниях: Оксфордский университет, Texaco, British Petroleum, Amoco, Shenandoah Oil, Norsk Hydro, Petrofina.