SIOSEIS started in 1978 when Paul Henkart joined Scripps Institution of Oceanography after 12 years with Texaco. He was supported by the Scripps Industrial Associates for 7 or so years. When those funds collapsed he worked part time on other projects in and out of Scripps. Around 1987 the U.S. National Science Fountain (NSF) started to partially fund SIOSEIS development and maintenance. Additional funds came through a copyright agreement with the University of California for the commercial sale of the software. Henkart also performed data analysis at sea.

Henkart stopped going to sea in 2009 and fully retired in 2014. IGPP refused to continue hosting http://sioseis.ucsd.edu in 2022 even though it contains ALL of the user documentation. http://sioseis.com was born.

Many other people wrote or modified parts of SIOSEIS.

Alistair Harding (SIO/UCSD) was a major contributor - FDMIGR, FKFILT, FK* bug finder/fixer Graham Kent (SIO/UCSD) created NMO velocity tracking waterbottom for realtime multi-channel processing. He also created process DMO. Dan Lizzeralde (WHOI) - bug finder/fixer, optimizer Mark Wiederspahn (UTIG) and Tom O'Brien (USGS) made significant improvements to several drivers (diskio.c, magnetic tape, raster plotters) John Shay (OSU) wrote frequency filtering. Randy Jacobson - Process Plot (raster plots) was based on Randy's work. Warren Wood (NRL) wrote several filtering options. Mary Kappus (SIO) wrote the slant stack routine. John Hopper (geus.dk) created realtime processing for USCG cutter Healy. David Hale (Stanford) - Routine for FKMIGR (Stolt migration). Mladen Nedimovic (WHOI, dal.ca) - several "cross-offset" and feathered streamer algorithms. Kurt Schwehr - MAKEFILE. c and f standards Books: Robinson: "Multichannel Time Series" Oppenheim and Schafer: "Digital Signal Processing" Press et al:"Numerical Recipes" Yilmaz: "Seismic Data Processing"