Roger Cousens is a Professor in the School of Resource Management School, University of Melbourne, Australia. He has published for over 20 years on ecology and population dynamics of weeds (including dispersal), especially on methodology. He worked at the Weed Research Organisation and Long Ashton Research Station (UK) before moving to Australia in 1989; since then he has lectured at University of Sydney, headed the weed science department of Agriculture Western Australia, and been the Chair of Plant and Soil Science and head of School of Agricultural Science at La Trobe University. Sinc...