I often don’t do book reviews, apart from my annual listing of my best reads. But this one simply couldn’t wait, considering the impact it had on me. The author of ‘The Defiant Optimist’, Dureen, is one of the accomplished Bangladeshis creating waves in the international domain. Her checkered career in investment banking, microfinance, development finance, media, social entrepreneurship, and academia held her in good stead when she founded Impact Investment Exchange (IIX).