In response to Lysenkoism's purge of geneticists, Luria decided to pursue a physician degree, which he completed with honors in the summer of 1937. After rewriting and reorganizing his manuscript for "The Nature of Human Conflicts", he defended it for a doctoral dissertation at the Institute of Tbilisi in 1937, and was appointed Doctor of Pedagogical Sciences. "At the age of thirty-four, he was one of the youngest professors of psychology in the country." In 1933, Luria married Lana P. Lipchina, a well-known specialist in microbiology with a doctorate in the biological sciences. The couple lived in Moscow on Frunze Street, where their only daughter Lena (Elena) was born.