Mark Ranalli

Mark Ranalli is the founder, president and CEO of BioSqueeze Inc., a Butte, Montana company that uses biomineralization - natural soil bacteria that grow limestone - to seal microscopic leaks in oil and gas wells and stop fugitive methane. A serial entrepreneur who previously built and led companies in publishing and telecommunications with workforces topping 700, he holds an electrical engineering and computer science degree from Stanford and an MBA from Dartmouth's Tuck School, and has served as a business-school dean. After scaling consumer-internet ventures, he turned to the unglamorous, high-stakes problem of leaky wellbores, backing a decade of Department of Energy and Montana State University research with a $7.4 million Series A.