This special issue is devoted to the memory of the late Alex B. Gershman whose contributions are a cornerstone of advances in array processing made over the last three decades. Alex was an active member of IEEE SPS. Alex’s seminal work is a pillar, which holds strong and steady the rising volume of sensor array processing research. He solved longstanding problems and made fundamental contributions to sensor array processing that inspired many others to follow suit, and paved the way for a continuous influx of new and innovative techniques. Important dates: August 1, 2012: Manuscript submission deadline October 1, 2012: Notification to authors December 1, 2011: Final manuscript submission March 1, 2013: Publication Guest Editors: Marius Pesavento, Technische Universität Darmstadt, Darmstadt, Germany Yuri I. Abramovich, WR Systems Ltd., Fairfax, Virginia, USA Fulvio Gini, University of Pisa, Pisa, Italy Nikos Sidiropoulos, University of Minnesota, Minneapolis, USA Abdelhak M. Zoubir, Technische Universität Darmstadt, Darmstadt, Germany More details regarding this Special Issue can be found at this link.