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Erik Gregersen
Encyclopædia Britannica Editor
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Erik Gregersen is a senior editor at Encyclopaedia Britannica, specializing in the physical sciences and technology. Before joining Britannica in 2007, he worked at the University of Chicago Press on the Astrophysical Journal. Prior to that, he worked at McMaster University on the ODIN radio astronomy satellite project.
Primary Contributions (398)
![Ronald McNair.](https://cdn.britannica.com/85/154785-050-DA153D10/Ronald-McNair.jpg?w=320&h=240)
Ronald McNair American physicist and astronaut who was killed in the Challenger disaster. McNair received a bachelor’s degree in physics from North Carolina Agricultural and Technical State University, Greensboro, in 1971 and a doctoral degree in physics from the Massachusetts Institute of…
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