Simon Fennell, partner, is a portfolio manager for William Blair’s International Growth, International Small Cap Growth, and International Leaders strategies. He joined William Blair in 2011 as a technology, media, and telecommunications research analyst focusing on idea generation and strategy more broadly. Before joining William Blair, Simon was a managing director in the equities division at Goldman Sachs in London and Boston, responsible for institutional equity research coverage for European and international stocks. Previously, Simon was in the corporate finance group at Lehman Brothers.

Ken McAtamney, partner, is a portfolio manager for William Blair’s International Growth, Global Leaders, and International Leaders strategies. He was previously the co-director of research and a mid-large-cap industrials and healthcare analyst. Before joining William Blair in 2005, Ken was a vice president at Goldman Sachs and Co., where he was responsible for institutional equity research coverage for both international and U.S. equity. Before that, Ken was a corporate banking officer with NBD Bank. He received a B.A. from Michigan State University, and an M.B.A. from Indiana University.

Andy Siepker, CFA, partner, is a portfolio manager for the International Growth and International Small Cap Growth strategies at William Blair Investment Management. Previously, he was an equity research analyst covering large-cap industrials and small-cap consumer analyst. Before that, Andy served on William Blair’s sell-side as a research associate, focusing on e-commerce and hardline retailers. Before joining William Blair in 2006, he was a financial analyst in a finance training program at First Data Corporation. Andy is a member of the CFA Institute and the CFA Society Chicago. He received a B.S. in finance, with high distinction, from the University of Nebraska.