  Wolfgang Priester was one of Germany's most versatile and quixotic
astrophysicists, re-inventing himself successively as a radio astronomer, space
physicist and cosmologist, and making a lasting impact on each field. We focus
in this personal account on his contributions to cosmology, where he will be
most remembered for his association with quasars, his promotion of the idea of
a nonsingular "big bounce" at the beginning of the current expansionary phase,
and his recognition of the importance of dark energy (Einstein's cosmological
constant Lambda) well before this became the standard paradigm in cosmology.
