Tim Bollerslev is a prominent economist known for his work in financial econometrics, particularly in modeling volatility in financial markets. He is best recognized for developing the Generalized Autoregressive Conditional Heteroskedasticity (GARCH) model, which helps in understanding and predicting the behavior of asset prices over time. Bollerslev has contributed significantly to the field through his research and publications, influencing both academic and practical applications in finance. He has held academic positions at various institutions, including Duke University, where he continues to teach and mentor students in economics and finance.