Raemer Edgar Schreiber (November 11, 1910 – December 24, 1998) was an American physicist from McMinnville, Oregon who served Los Alamos National Laboratory during World War II, participating in the development of the atomic bomb.

After the war, he served at Los Alamos as a group leader, and was involved in the design of the hydrogen bomb.

In 1927 he entered Linfield College in McMinnville, where he majored in physics and mathematics, and received his Bachelor of Arts degree in 1931.

The Water Boiler group was headed by Donald W. Kerst from the University of Illinois, and consisted mainly of people from Purdue who had been working on calculations for Edward Teller's thermonuclear "Super" bomb.

Schreiber worked on improved reactor designs until April 1945, when he was transferred to Robert Bacher's Gadget (G) Division as a member of the pit assembly team for the Trinity nuclear test.

Comparing it with the firebombing of Tokyo by B-29 bombers that killed 100,000 people in one night in March 1945, Schreiber noted that: Just the fact you could do the same thing with one airplane and one bomb proved the efficiency, but it didn’t change the effect very much.

But the firebombing, the saturation bombing of the B-29s, was not bringing Japan to its knees, and the shock effect of one airplane being able to wipe out a city, I think, is what finally convinced the Japanese military they had to give up.

Slotin would die from radiation poisoning nine days later but his quick reaction saved the lives of Schreiber and the others in the room.

Schreiber became an exponent of remote handling of dangerous substances, and designed remote-control machines to perform such experiments with all personnel at a quarter-mile distance.

"[9] In 1955, Schreiber became the head of the Nuclear Rocket Propulsion (N) Division, which was responsible for Project Rover and NERVA.

[8] Schreiber and Marguerite bought a property at Pajarito Village in the Española Valley in the late 1940s, where they built an adobe home on the weekends.