He displayed early promise, showing favorably at the Mutulidad Fine Arts Exhibition with an honorable mention at 16 and a prize at 17 for sculpture.
Three years later, Lasansky began his career as director of the Free Fine Arts School in Villa María, Argentina.
[citation needed] Lasansky relocated to New York City in 1943 on the first of five Guggenheim Fellowships and chose to remain in and become a citizen of the United States for political reasons in spite of a lack of financial resources and challenges with the English language.
Within three years, he would become a full professor and ultimately would establish its school of printmaking, offering the first Master of Fine Arts program in the field in the United States.
The drawings, on regular paper with graphite pencil and watercolor washes meant to suggest blood, portrayed the victims and perpetrators of the atrocities of the Holocaust, but also the bystanders, whom Lasansky felt strongly bore a share of responsibility.