Frits Zernike was a Dutch physicist known for his significant contributions to the field of optics, particularly in the development of phase contrast microscopy. He was born on July 16, 1888, and passed away on March 10, 1966. Zernike's work enabled the visualization of transparent specimens, such as living cells, without the need for staining, which can alter their natural state.
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A physicist.[ref]
https://www.rug.nl/fse/nobelprize-zernike/frits-zernike-1888-1966?lang=en. Independent professional profile
Portrait of Frits Zernike
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