Publications by Jack Crenshaw

Scientific articles by Jack Crenshaw who spent many years working for NASA in 1970 and helped develop computer systems that allowed successful crewed missions to the Moon.

Looking up from Earth
Emmanuel Gonzalez-Escobar, Pressure Ink, (2018)

Very few people can begin a story of their life with “I helped to put people on the Moon”. That almost inevitably leads to a long pause as a myriad of questions daunts over the audience and an eerie metaphorical wind creeps in, like a fog that meanders into a meadow on a misty Monday morning. And that wind changes people’s facial expression from intrigue and excitement to unease and doubt; eyebrows move up and down in rhythm as eyeballs shift from left to the right. Now that audience is looking at each other, waiting for the story to continue. And the storyteller stares out into the space beyond the podium and sees the look of bewilderment and mere astonishment that slowly appears on the faces of his listeners. He knows he’s got the audience in his hands. Some even muse at the idea that the storyteller will follow up with, “after Apollo, I retired”. But for Jack, Project Apollo was truly just the beginning of a long career and his story continues with as much emphasis on the future as Project Apollo did. He continues to work on trajectory simulations, while hoping that one day, a new Space race will unites us all, and through exploration of the vastness and emptiness of Space come to perhaps learn to appreciate the fullness of life on Earth.

We would like to thank Jack Crenshaw for giving us permission to share his lifetime of scientific achievements. We fully support his wishes for this information to remain on a freely-accessible space and will continue to host his contributions to science for many years to come. Thank you Jack.
All materials shared here are subject to Copyright © J. Crenshaw, Ph.D.


Read recent blogs by Jack Crenshaw on

Fly me to the Moon.
Jack W. Crenshaw, embedded blog, (2010)

Calculating trajectories for Apollo program.
Jack W. Crenshaw, embedded blog, (2009)

Gravity effects on the rotational motion of a uniaxial artificial satellite.
Jack W. Crenshaw and Philip M. Fitzpatrick AIAA Journal, (1968)

Theoretical determination of gravity effects on the rotational motion of a uniaxial rigid close earth satellite.
Jack W. Crenshaw and Philip M. Fitzpatrick, 5th Aerospace Sciences Meeting, (1967)

Unified two-body functions.
Jack W. Crenshaw, Journal of Spacecraft and Rockets (1966)

Sphere of influence in patched-conic methods.
Jack W. Crenshaw, AIAA Journal (1963)

Trajectory considerations for circumlunar missions.
William H. Michael, Jr. and Jack W. Crenshaw, NASA Langley Research Center, (1961)


Compiler tutorial:
Also, a spin-off by PP4s:


Jack Crenshaw: The Space Pioneer You Never Heard Of.
Collin Skocik, Spaceflight Insider, (2016)

An Interview with Jack Crenshaw.
Matthew Reed, Radio Shack TRS-80, (2009)

An Interview with Jack Crenshaw.
Resonance Publications, (1999)


Math Toolkit for Real-Time Programming 1st Edition

By Jack W. Crenshaw (2000)
ISBN-13: 978-1929629091
ISBN-10: 1929629095
Publisher : CRC Press; 1st Edition (January 9, 2000)

Available on Amazon (US) | (UK)

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