Jim Diana was a Professor of Fisheries and Aquaculture, as well as the previous Director of the Michigan Sea Grant Program, funded by the National Oceanic and Atmospheric Administration. His research focused on aquatic animals and their interactions with the environment. This is expressed in two major research areas: sustainable aquaculture and its role in feeding the world, and the ecology of natural fish populations, particularly in the Great Lakes region. As aquaculture is the dominant means of producing seafood today, its environmental impacts are important, and we need to understand and remediate them in order to more sustainably produce aquaculture crops. Jim’s research focused on the interaction between aquaculture practices and environmental impacts and seeks to find solutions for more sustainable production in the future. Secondly, human impacts on natural systems have resulted in dramatic declines in many fish species throughout the world, particularly in the Great Lakes region. His research focus in fish ecology is on the management, restoration, and rehabilitation of wild populations inevitably influenced by human disturbance. Jim’s teaching is in Aquatic Sciences, in particular, courses in Ecology and Biology of Fishes and Sustainable Aquaculture. In addition, he supervised research of a large number of graduate students in Aquatic Sciences.