Highlights from 50 years of turbulent boundary layer research

This paper grew out of a survey lecture on highlights from the history of turbulent boundary layer research since the Turbulence Colloquium held in Marseille in 1961, the proceedings of which were published the next year. The highlights chosen, of course, reflect my own interests, experience and knowledge of the field. Necessarily, much important work is not mentioned, but I hope the references in the work cited will lead readers deeply into the many branches this research field has developed over these five decades. It is a rich field, and the progress in understanding this technically and scientifically important flow has been dramatic, but there is still much to learn.