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Dr. Gerrit L. Verschuur is best known for his work in radio astronomy. In his primary field of study Verschuur pioneered the measurement of the interstellar magnetic field using the 21-cm Zeeman effect technique. He is also co-inventor on a dozen patents, his favorites being on ways to read bar codes inside sealed envelopes. The third edition of his book, “The Invisible Universe: The Story of Radio Astronomy,” was published by Springer in 2015.