Soheil Esmailzadeh
Global Head of Technology and Quantitative Research
About Soheil
Soheil Esmailzadeh is the global head of technology and quantitative research at William Blair Investment Management. He is also a member of Investment Management’s executive leadership team. Soheil is responsible for the strategic direction, development, and coordination of all investment-related technology and quantitative initiatives across Investment Management.
Before joining the firm in 2025, he was chief investment officer and head of research at Vatic Labs in New York. Previously, Soheil held a variety of leadership roles focused on quantitative research and technology at Magnetar Capital. Before that, he worked at Barclays Global Investors and Citadel Investment Group.
Soheil received a B.S. in physics from the University of California at Los Angeles, an M.S. in physics and a Ph.D. in theoretical physics from Stanford University.
Why We Invest Shapes How We Invest
Culture is more than the ethos that characterizes our organization; it’s the engine that guides our practices. Our people are defined by their shared values and curiosity. Our approach is defined by teamwork; a disciplined, proven methodology; and technology-enhanced collaboration. Our purpose is defined by a focus on our clients and communities. But don’t take our word for it. See what culture means to our colleagues.
Read more
About William Blair
William Blair is a premier global partnership with expertise in investment banking, investment management, and private wealth management. We provide advisory services, strategies, and solutions to meet our clients’ evolving needs. As an independent and employee-owned firm, together with our strategic partners, we operate in more than 20 offices worldwide.*
-
1935Year William Blair was founded
-
1,950+Employees worldwide
-
154 billion+Client assets
-
90+ YearsIndependent and employee-owned
-
20+Offices worldwide
-
650+Companies under coverage
As of December 31, 2025
*Includes strategic partnerships with Allier Capital, BDA Partners, and Poalim Equity.