During the past half century, ecology has emerged from its roots in biology to become a stand-alone discipline that interfaces organisms, the physical environment and human affairs. This is in line with the root meaning of the word ecology which is ‘the study of the household’ or the total environment in which we live. When I first came to the University of Georgia in 1940 as an instructor in the Department of Zoology, ecology was considered a rather unimportant sub-division of biology. At the end of World War II, we had a staff meeting to discuss ‘core curriculum’, or what courses every biology major should be required to take. My suggestion that ecology should be part of this core was rejected by all other members of the staff; they said ecology was just descriptive natural history with no basic principles. It was this ‘put down’, as it were, that started me thinking about a textbook that would emphasize basic principles, which eventually became the first edition of my Fundamentals of Ecology, published in 1953. In those early days ‘ecology’ was often defined as the ‘study of organisms in relation to environment’. The environment was considered a sort of inert stage in which the actors, that is the organisms, played the game of natural selection. Now we recognize that the ‘stage’ and the ‘actors’ interact with each other constantly so that not only do organisms relate to the physical environment, but they also change the environment. Thus, when the first green microbes, the cynobacteria, began putting oxygen into the atmosphere, the environment was greatly changed, making way for a whole new set of aerobic organisms. Also, when one goes from the study of structure to the study of function, then the physical sciences (including energetics, biogeochemical cycling and earth sciences in general) have to be included. And, of course, now more than ever, we have to consider humans and the social sciences as part of the environment. So we now have essentially a new discipline of ‘ecology’ that is a three-way interface.