Carnegie welcomes four new staff researchers. Anna M. Michalak joins the Department of Global Ecology. Prior to joining Carnegie, she was the Frank and Brooke Transue Faculty Scholar and an associate professor at the University of Michigan, and recently completed a sabbatical as a faculty fellow at the Institute for Mathematics Applied to Geosciences at the National Center for Atmospheric Research in Boulder, Colorado. Her research focuses on characterizing complexity and quantifying uncertainty in environmental systems. Examples of her recent work include the quantification of atmospheric greenhouse gas emissions and sequestration, and the assessment of potential climate impacts on water quality.