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Basically the people who researched the electromagnetic spectrum

Roger Bacon

Observed visible light in the 13th century

Sir Isaac Newton

Experimented with prisms in the 17th century

William Herschel

discovered infrared (increase in temperature just beyond the red end of the visible light spectrum) in 1800

Johann Ritter

observed that just beyond the violet end has the ability ot cause a chemical reaction with certain types of metals (UV) in 1801

Heinrich Hertz

generated and detected waves; expanded this experiment for higher frequencies - Radio waves and microwaves (in 1888)

Wilhelm Roentgen

discovered radiation while conducting experiments with cathode ray tubes - x-rays (1895)

Paul Villiard

discovered gamma rays (the "last" type of electromagnetic radiation)

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