The moment Hemanth Kappanna boarded that flight, it seemed like his best days were behind him. He’d helped uncover Volkswagen’s conspiracy to cheat emissions regulations, revealing a complex, devious mechanism that allowed VW’s diesels to spew carcinogenic, climate-changing pollutants unfiltered into the atmosphere. His team, in a tiny engineering department at a not terribly prestigious public university, used a $70,000 grant to track down a deception that the U.S. Environmental Protection Agency (annual budget: over $8 billion) hadn’t detected. Kappanna and his colleagues published data that led to one of history’s biggest legal settlements, with Volkswagen paying roughly $21 billion in fines, penalties, and civil suits in the U.S. alone. Executives went to prison. VW’s CEO resigned in disgrace.

Kappanna and his team’s work led to a seismic shift in the automotive industry. But now he was jobless in America, with an expiring work visa. All he had was a one-way ticket to India, the country he’d left nearly 20 years ago. His return to Bangalore was not a hero’s welcome. He took public transit from the airport to his mother’s home and tried to avoid anyone he knew.

For years, Kappanna had lived the American dream. He arrived in the U.S. in 2002, 23 years old and freshly accepted to the engineering master’s program at West Virginia University (WVU). “Engineering was the way forward for us,” Kappanna says. “Back when I was studying, it was either engineering, medicine, or law.”

It was the first time he’d ever left India; this skinny, five-foot-10 kid had barely even ventured outside Bangalore, India’s third-biggest city. Talk about culture shock. “Compared to Bangalore, WVU is a village,” Kappanna says. He enrolled without financial aid, washed dishes in a dormitory dining hall, and studied under Mridul Gautam, PhD, whose specialties include real-time emissions testing on heavy-duty diesel trucks.

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