Abstract
Many entrepreneurial firms risk falling into a cash flow “Valley of Death”‐the stage of a young firmʼs life when seed funding is running dry but the firm has yet to secure sufficient additional funding to carry it through to product commercialization. This is particularly true in the nascent cleantech sector, where investments are often complex and capital intensive. Drawing on an in-depth interview with seasoned entrepreneur Brian Cunningham, CEO of the Wave Energy Conversion Corporation of America, this article explores the role of persistence in entrepreneurship, distinguishing between “calculated” and “blind” persistence.