Morris K. Jessup
From the UAP Encyclopedia, the open encyclopedia of UFO and UAP history · 👤 Person
Contents 3
| Type | Person |
|---|---|
| Also known as | Morris Jessup, Jessup |
| On the Timeline | 2 events, 1956 |
Morris K. Jessup (1900–1959) was an American astronomer and writer. He studied astronomy at the University of Michigan and worked on archaeological expeditions before turning to writing.
The Case for the UFO

In The Case for the UFO (1955), Jessup argued that UFOs might be alien craft using unknown propulsion and speculated about gravity. In 1955–56 he received letters from a man calling himself Carlos Allende (Carl Meredith Allen), describing a 1943 Navy experiment in Philadelphia that made a ship invisible. In 1956 the Office of Naval Research received an annotated copy of Jessup's book, later reprinted by the Varo company. Jessup died in Florida in 1959, ruled a suicide, which fuelled conspiracy stories.
On the UAP Timeline
- Varo edition of The Case for the UFO (April 1956) — Navy researchers receive an annotated copy of Morris Jessup's UFO book with strange handwritten notes.
- Allende letters and the Philadelphia Experiment (April 1956) — Morris Jessup receives letters claiming a secret Navy experiment at the Philadelphia Navy Yard.
References
- The Varo edition annotations — Obscurantist · obscurantist.com · archived copy
- Hoaxes from space: the Philadelphia Experiment — Swallowing the Camel · swallowingthecamel.me · archived copy
- Carl Meredith Allen ('Carlos Allende') — Wikipedia · en.wikipedia.org · archived copy
- The Case for the UFO: The Varo Edition (reprint) · pastforward.org · archived copy
- Philadelphia Experiment — Wikipedia · en.wikipedia.org · archived copy
- Carlos Allende (Carl Allen) — Obscurantist · obscurantist.com · archived copy
- The Philadelphia Experiment — Skeptic's Dictionary · skepdic.com · archived copy
This page was last edited on 29 October 2026. Articles are written in our own words from the sources listed under References; disputed claims are attributed to the people who made them.
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