Euan Sinclair is an option trader with over 25-years of professional trading experience. He has traded options on indices, stocks, commodities and interest rate products. He holds a PhD in theoretical physics from the University of Bristol and has written three books: “Volatility Trading”, “Option Trading” and “Positional Option Trading”, all published by Wiley. He is a member of the editorial board of the Journal of Investment Strategies - a publication of Risk Journals, and has written several papers on options, volatility and bet sizing.