From the author’s obituary:
Mr. Nettis discovered the magic of creating photographic images when he was 12 and visited a friend who had a darkroom in his home in West Philadelphia. (…) In 1953, he earned a bachelor's degree from Philadelphia College of Art, now the University of the Arts. He then embarked on a career in studio work, advertising, and photojournalism. After National Geographic published photos from his bicycle trip through Europe in 1955, he persuaded the magazine to sponsor a round-the-world journey in the spring of 1956. What originally was to be a three-month trip lasted more than a year. (…) After completing his work for National Geographic, he struck out across Spain, where he shot 10,000 photos for a book he eventually published, A Spanish Summer.