Carl was educated as a forest ecologist, but his interests have diverged into several other fields, including forest management, land-cover mapping, field-based games, crowdsourcing, and data mining. He received his bachelor’s degree in plant biology from the University of Illinois and his PhD in forest ecology from Duke University. In 2011 he joined a study of local forest institutions in IFRI sites and took part in IFRI training at Indiana University. For that project he conducted field work and trained teams to implement experimental games in Uganda and Bolivia. Currently, Carl is a postdoctoral scholar at the International Institute for Applied Systems Analysis in Laxenburg, Austria where he studies data quality aspects of crowdsourcing, particularly as it is applied to land-cover mapping tasks. He continues to collaborate with other IFRI researchers on analysis of data from specific sites and from the broader database.