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The aim of this article is to put Torsten Hägerstrand’s contribution to the development of the activity approach in transport geography into the context of his development of time-geography as an integrative ecological world view. This is discussed from a biographical perspective where experiences in his everyday life and scientific investigations are linked into a theoretical whole. The theoretical approach of Hägerstrand can be traced to experiences several years before he presented his time-geographic approach. He studied conditions for individuals’ existence in different geographic, social, and ecological contexts by engaging new methods and cross-fertilizing research fields; he developed precise concepts and a notation system general enough to describe any kind of individual and applicable at different levels of aggregation. He combined theoretical and methodological developments in science with active …