Rehana received her doctorate in mathematics from Wesleyan University in 2003. Since then, she has held faculty positions in mathematics at several institutions, including Harvard University (2007-2010) and Olin College of Engineering (2012-2016). In those capacities, she taught classes at all levels of undergraduate mathematics, from Algebra and Pre-Calculus, through Calculus and Linear Algebra, to Discrete Mathematics and Number Theory. She has also been involved in several initiatives for supporting students individually in their mathematics courses, from curriculum design to mentoring and teacher training.
Rehana has been received the Mentor of the Year Award from the Harvard Graduate Women in Science & Engineering, has been nominated for the Joseph R. Levenson Memorial Teaching Prize at Harvard, and is a two time recipient of the Bok Center Certificate of Distinction in Teaching from Harvard University.