Levine’s work encompasses controls over the success and impacts of exotic plant invasions; species diversity and ecosystem function; mechanisms underlying rare plant persistence; determinants of plant commonness, rarity, and coexistence. Putting his work into perspective, Levine explains that the invasion of species into new biogeographic regions is a process that has regularly occurred over geologic time. Over the last millennium, however, the human-mediated transport of species across the globe has increased the rate of invasion several orders of magnitude. Levin has taught at UCSB, UCLA, and at the Imperial College in the UK. He is a member of the American Society of Naturalists, the Ecological Society of America, and the Society for Conservation Biology.