bulk_extractor is a group effort from many authors and contributors, including:

Simson L. Garfinkel <slgarfin@nps.edu>  (overall design)
Bruce Allen <bdallen@nps.edu>           (BEViewer, exif analyzer, windows prefetch rewrite, hashdb scanner)
Alex Eubanks <endeavor@rainbowsandpwnies.com>  (pe and ELF scanners)
Luis E. Garcia II <legarcia@nps.edu>    (Initial windows prefetch implementation)
Michael Shick <mfshick@nps.edu>         (odds and ends)
Joel Uckelman <uckelman@nomic.net>      (Lightgrep integration and build configuration)
Mark Richer <mhricher@nps.edu>          (documentation and release material)
Joachim Metz <joachim.metz@gmail.com>   (release packaging and continuous integration)
Teru Yamazaki(@4n6ist)                  (scan_evtx, scan_ntfsindx, scan_ntfslogfile, scan_ntfsmft, scan_ntfsusn)
Alex Eubanks (endeav0r)                 (scan_winpe)

For a list of all contributors, please see:
https://github.com/simsong/bulk_extractor/graphs/contributors?all=1

Extensive testing on various versions has been performed by:

Matthew Haubach (@the_pgh_cid)
Jon Stewart <jon@lightboxtechnologies.com>

bulk_extractor version 1.x included support for LIFT, which was developed by Carnegie Mellon University
under contract to the Department of Defense. The team members were:
  Siddharth Gopal <sgopall@cs.cmu.edu>
  Yiming Yang <yiming@cs.cmu.edu>
  Konstantin Salomatin <ksalomat@cs.cmu.edu>
  Jaime Carbonell <jgc@cs.cmu.edu>
