Tim Melbourne is professor of geophysics at Central Washington University and director of the Pacific Northwest Geodetic Array (www.panga.org) that comprises ~300 continuous GNSS stations across the Cascadia subduction zone. His expertise includes static and real-time point-positioning, global earthquake and tsunami early warning using real-time GNSS, vertical land motion estimation for sea-level rise and climate change analyses, earthquake and slow-slip geodetic inversions, and others. He chairs the Geohazards Focus Area of the International Association of Geodesy and is a member of the Scientific Earthquake Studies Advisory Committee (SESAC) to the USGS National Earthquake Hazards Reduction Program. A list of publications may be found at www.panga.org/pubs.