Elizabeth Armstrong Wood (1912–2006) was an American crystallographer and geologist who ran a research program at Bell Telephone Laboratories that led to the development of new superconductors and lasers.

[1] In 1942, Wood—whose interest in crystallography had developed at Bryn Mawr—took a job in the Physical Research Department of Bell Telephone Laboratories, where she was the first woman scientist hired as a Member of the Technical Staff (MTS).

For over two decades, she ran a crystallographic research program at Bell Labs (Murray Hill, NJ), focusing primarily on the electromagnetic properties of crystals.

[1] She looked at phase transitions in silicon, irradiation coloring in quartz, and ways to change the state of certain materials through the application of electric fields.

Her Crystals and Light (1964), written for people with no prior background in optics, was long considered the standard beginner's textbook in the field.

In 1964, Bell Labs debuted its "Picturephone" system, with limited commercial service in a few cities.

The service was inaugurated with a ceremonial call from First Lady Bird Johnson to Wood in Bell Labs' videophone center in New York City.