An EXIST Science Working Group (EXSWG) has been formed to further define the science and mission needs for EXIST. The EXSWG is likely to expand beyond the present initial group as the mission is further defined and considered in the planning process. Current members of EXSWG are:

• Lars Bildsten (ITP/UCSB)
• Roger Blandford (Caltech)
• Deepto Chakrabarty (MIT)
• Andy Fabian (IOA, Cambridge, UK)
• Fabrizio Fiore (Rome Obs./BeppoSAX, IT)
• Jerry Fishman (NASA/MSFC)
• Martin Elvis (CfA/SAO)
• Neil Gehrels (GSFC)
• Josh Grindlay (CfA/Harvard)
• Chuck Hailey (Columbia Univ.)
• Fiona Harrison (Caltech)
• Dieter Hartmann (Clemson Univ.)
• Chryssa Kouveliotou (NASA/MSFC)
• Tom Prince (Caltech)
• Brian Ramsey (MSFC)
• Rick Rothschild (UCSD)
• Gerry Skinner (CESR, Toulouse)
• Stan Woosley (UC Santa Cruz)