Nelli Oster, PhD, Director, is an Investment Strategist in BlackRock's Multi-Asset Strategies Group, where her responsibilities include developing tactical country, sector and asset allocation models for implementation with iShares ETFs, in addition to relating the Investment Strategy Team's research and investment views to key institutional and financial advisor clients. Dr. Oster's service with the firm dates back to 2008, including her time with Barclays Global Investors (BGI) which merged with BlackRock in 2009. At BGI Dr. Oster did research and portfolio management in the firm's quantitative stock selection business across the global portfolios. Prior to joining BGI, Dr. Oster was an Equity Research Analyst at Goldman Sachs after beginning her career in the Mergers and Acquisitions group of Salomon Smith Barney. Dr. Oster holds a BSc (Hons) in Management Sciences from the London School of Economics and a PhD in Finance from the Stanford Graduate School of Business, where her Behavioral Finance dissertation focused on expectations formation and learning in the financial markets.