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 the head of the global equity team and a portfolio manager for William Blair’s International Growth, Global Leaders, International Leaders, and Emerging Markets Leaders strategies. Ken is also a member of the Investment Management leadership team. He was previously 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, he was a corporat

Andrew Siepker, CFA, Partner, has co-managed the International Growth Fund and the Institutional International Growth Fund since 2022 along with associated separate account and commingled fund portfolios. Mr. Siepker is also a global equity research analyst covering industrial companies. Previously, he was a research analyst conducting non-U.S. consumer research and worked on William Blair’s sell-side as a research associate focused on e-commerce and hardline retailers. Before joining William Blair in 2006, Andy was a financial analyst in a finance training program at First Data Corporation. He is a member of the CFA Institute and the CFA Society Chicago. Andrew received a B.S. in Finance, with high distinction, from the University of Nebraska.