Isaac Michael "Zick" Rubin (born 1944) is an American social psychologist, lawyer, and author. He is "widely credited as the author of the first empirical measurement of love," for his work distinguishing feelings of like from feelings of love via Rubin's Scales of Liking and Loving. Science Progress stated, "The major breakthrough in research on love came from the pioneer psychometric work of Zick Rubin."
He has also published on disclosing to consequential strangers. According to The Cambridge Handbook of Personal Relationships, Rubin "conducted influential early studies on disclosure reciprocity in naturalistic settings, such as in airport departure lounges and at bus stops." His work also examined the development of friendship among toddlers.
Rubin earned a Bachelor of Arts degree from Yale University in 1965 and a Ph.D. from University of Michigan in 1969.
In the 1980s, Rubin entered Harvard Law School, earning his law degree and being admitted to the Massachusetts bar in 1988.
In the 2001 edition of The Penguin Dictionary of Psychology, Rubin was listed as having died in 1997. In 2011 he wrote a New York Times op-ed about his attempts to correct the error after it had been repeated in a Wikia profile about him.