This is a novel by A.E. Van Vogt, first published in 1950 (an amalgam of four short stories that Van Vogt had originally published between 1939 and 1950). The protagonist a Dr. Grosvenor is the first graduate of the Nexial Institute. Grosvenor has been trained in integrated science and thought and was able to see the connection between many aspects of a problem that other specialists could not see because of their narrow training.
Nexialist: One skilled in the science of joining together in an orderly fashion the knowledge of one field of learning with that of other fields.
The cover of the 1950 original edition of Voyage of the Space Beagle (Simon & Schuster). From a collection HERE of cover art from numerous international editions.