Harry John Betteley Birks (John) is a botanist and emeritus professor at the University of Bergen and University College London. He is best known for his work on the development of quantitative techniques in Quaternary palaeoecology. He has researched the vegetational and environmental history over the past 10–20,000 years in many parts of the world, including Fennoscandia, UK, Minnesota, the Yukon, Siberia, and Tibet. Source: Wikipedia (en)