we thank Johannes for providing us with the occasion to gather in his name and for shaping and supporting the careers of so many of us. May 2007 R. von Steiger, G. Gloeckler, G.M. Mason Space Sci Rev (2007) 130: 3-4 DOI 10.1007/s11214-007-9240-0 Acknowledgement Published online: 21 July 2007 (c) Springer Science+Business Media B.V. 2007 Early in 2006, Edward C. Stone, Principal Investigator of NASA's Advanced Composition Explorer (ACE); Len A. Fisk,...