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In page Margaret G. Kivelson:

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Over the course of Julian Schwinger's career he had more than 70 graduate students and of these Kivelson was his only female student. In 1954, she gave birth to her first child, and afterwards she often faced criticism for continuing to work despite being a mother.[citation needed] In 1955 her husband received an appointment at UCLA and she followed him to Los Angeles.[2] She started working part-time at the RAND Corporation while completing her thesis. A few months after receiving her PhD in 1957, she gave birth to her second child.[1][3]