He began work at NCAR in 1986 as a student assistant, and has been involved in several generations of climate model development in CGD. He is the primary data manager and data scientist for the latest NCAR climate model, the Community Earth System Model (CESM). He has led the major data management activities and projects for the CESM since 2003, including CMIP3 and the current CMIP5. He is also one of the key personnel for the Earth System Grid (ESG) project, participating since its inception in 2001. Gary has also created a number of visualizations of CESM output that have been used in many scientific presentations as well as in major broadcast media.