context: He earned his master's degree in biology at Reed College and his PhD at Princeton University in 1943.
source: After college, McElroy became a professor at Johns Hopkins University.
reference_original: بعد الجامعة، أصبح McElroy أستاذ في جامعة Johns Hopkins.
reference_flipped: بعد الجامعة، أصبحت McElroy أستاذة في جامعة Johns Hopkins.