David W. Tschanz

David W. Tschanz holds advanced degrees in history and epidemiology and has worked for Saudi Aramco in Dhahran since 1989. He writes primarily about history, medicine and technology. The second edition of his book 'Petra: A Brief History' will be published in March.

Image taken from: http://www.amazon.com/David-W.-Tschanz/e/B001IQZE60