Ruth Agnes McCall Robertson Marietta (May 24, 1905 – February 17, 1998)[1] was an American photojournalist who accomplished many "firsts" for women photographers[2] and is also known mostly for photographing Angel Falls in Venezuela and surveying them to establish them as tallest waterfalls in the world; it was published in National Geographic magazine, November 1949.

"[2] Robertson had been a journalist during World War II and after she returned to her routine job at the New York Herald Tribune, felt that her "life lost its thrill.

[5] On April 23, 1949, she set out on an expedition to the base with the Latvian explorer Aleksandrs Laime[6] to reach the falls.

[4] The Ruth Robertson Archives have been preserved at the Harry Ransom Center of the University of Texas in Austin.

[2][9][4] Author Kathryn Casey's book, Angel Falls, released in September 2023, was inspired by Robertson's life.