In 2002, Cremin co-founded Frontier Venture Capital with Scott Lenet and Draper Fisher Jurveston.

He has helped lead investments in Dailypay, Coterie Insurance, SubjectWell, Prolacta Bioscience, Big Frame (DreamWorks), AudioMicro (Zealot Networks), Clear Access (Cisco), MaxPreps (CBS), among others.

Cremin started teaching venture capital and entrepreneurship at the Orfalea College of Business at California Polytechnic State University in San Luis Obispo in 2003; he was adjunct professor there until 2009.

He has helped form and served on the advisory board of the Entrepreneurship Center at UC Santa Barbara, where he was an adjunct professor from 2003 to 2010.

Cremin is the son of Lawrence A. Cremin, a professor of education at Teachers College in New York, where he was president from 1974–1984[2] He was awarded a Pulitzer Prize for history in 1981 for "American Education: The National Experience, 1783-1876," the second volume of his three-volume history of U.S. schools[3] Cremin is the grandson of Arthur T. Cremin a serial entrepreneur, who among other things created a chain of music schools, providing inexpensive music lessons in neighborhoods across New York City, and providing frequent classical music concerts highlighting the schools’ students at various venues including Carnegie Hall.