By the time of the World Convention Asimov was a bona fide author in his own eyes because
Astounding
had published his tenth story, "Trends," in its issue of July 1939. Almost two years later it published the second of his robot stories (the first, "Robbie," was published in the September 1940
Super Science Stories
as "Strange Playfellow''), and within the next fourteen months, two more robot stories, plus "Nightfall," and "Foundation" and its sequel. Though Asimov didn't know it at the time, "Nightfall" alone made him, in his own words, "a major figure in the field." The stories did not earn that much money, but what they brought in was put to good use, paying for his tuition or accumulating in a bank account. He had three stories published in 1939, seven in 1940, eight in 1941, ten in 1941, only one in 1943, three in 1944, four in 1945, one in 1946, one in 1947, two in 1948, three in 1949, and six in 1950.