- PSPP Authors
-
- * Ben Pfaff wrote most of the program and the manual.
- * John Williams wrote the T-TEST procedure.
- * Jim Van Zandt translated the `julcal' date calculation package
- into C from code written by Michael Covington, which was based on
- formulae by Jean Meeus.
+We wish to thank current active contributors to PSPP:
+
+* Ben Pfaff wrote the initial program and manual, which comprises the
+majority of the current code. Ben continues to contribute and
+most of the core libraries which ensure that PSPP runs with optimal
+speed are his work.
+
+* John Darrington wrote the graphical user interface, and the T-TEST,
+ONEWAY, EXAMINE, RANK and NPAR TESTS commands, implemented support
+for long variable names, psql and gnumeric and made numerous revisions
+to other modules.
+
+* Jason Stover contributed statistical and numerical functionality,
+including lib/gslextras and the linear regression features. Jason
+is also an important contributor to GSL, which is used by PSPP.
+
+We also thank past contributors:
+
+* John Williams wrote an initial draft of the T-TEST procedure.
+
+* Michael Kiefte contributed bug fixes and other enhancements.
+
+* Patrick Kobly contributed bug fixes and other enhancements.