Joe J. Colletti, business development manager for acquisitions and divestitures at ExxonMobil Upstream Business Development Co., is today’s featured Forty Under 40 honoree.

Despite, today, overseeing business development opportunities in the U.S. for Exxon Mobil—one of the world’s largest public oil and gas companies, Colletti began his career as a nuclear systems engineer.

In 2013, he transitioned from his six-year engineering tenure with Exxon Mobil Corp. to become the operations manager for the private E&P Zarvona Energy LLC.

After three years at Zarvona, Colletti was promoted to vice president of business and project development, where he helped grow Zarvona into one of the most notable private operators in the U.S.

Colletti said the small company environment taught him to be resourceful and “to understand the importance of every aspect of the industry.”

Click here for Joe J. Colletti’s complete profile.

Take a look at all of the Forty Under 40 honorees.