Gary L. Gastineau passed away on October 11 in Naples, Florida. Born in Dayton, Ohio in 1940 to Lillian and Amos W. Gastineau, Gary graduated with honors from Harvard College (1962) and was a Baker Scholar at Harvard Business School (1964). He went on to pursue a successful career in finance. Most notably, he was an expert on exchange-traded funds (ETFs), directing product development at the American Stock Exchange; serving as Managing Director of Exchange-Traded Fund Product Development at Nuveen Investments; and co-founding Managed ETFs LLC. Gary contributed numerous books and articles to the literature on finance and investing, including The Exchange-Traded Funds Manual (John Wiley & Sons, 2nd ed., 2010); The Options Manual (McGraw Hill, 1988); and, with Mark Kritzman, The Dictionary of Financial Risk Management (Probus, 1992; 1999). Gary loved to read and was an avid skier. He is survived by his wife of 55 years, Nancy Gastineau; his daughters, Gayle Wholley and Nicole Gastineau Campos; and four grandchildren, Milo and Maeve Wholley and Fabiola and Benjamin Campos. He always wanted to travel to space. We are grateful he can now achieve his dream.