Jennifer Rumsey and the long way home

Jennifer Rumsey acquired two engineering degrees and a job at a fuel-cell startup, then discovered a small flaw in her plan to live outside Indiana: she liked Indiana. In 2000, she and her husband returned to Columbus. Cummins, the engine company headquartered there, offered something more persuasive than familiar streets. It offered difficult work that she wanted to do.

Her explanation was practical. Making diesel engines better for the environment interested her. So did the range of jobs available to an engineer inside the company. The return was a choice about the substance of a working life. Columbus happened to come with it. Twenty-two years later, she became Cummins’ chief executive.

That distance, from hometown intern to the person responsible for the company, can make a career look inevitable. Rumsey has been clear that she did not grow up with a settled ambition to become an engineer or work at Cummins. She began considering engineering in high school. Familiarity supplied possibilities; it did not supply a script.

The education between the summers

Her father was an engineer. At Purdue, Rumsey studied mechanical engineering and spent her summers interning at Cummins. The combination gave her a way to test classroom ideas against actual equipment. A machine has a useful habit of exposing the gap between understanding an equation and understanding what it does.

Purdue also supplied a less glamorous education. Schoolwork had come relatively easily before college. University required her to learn how to study. She adjusted, made friends and found supportive professors. It is an unusually helpful detail in a successful engineer’s biography: competence included learning a new way to work, rather than simply arriving already equipped.

She graduated with highest honors in 1996, then earned a mechanical engineering master’s at MIT in 1998 with a National Science Foundation fellowship. Her early work at Nuvera Fuel Cells in Cambridge focused on controls. Fuel cells belonged to her professional life long before she was responsible for explaining an engine manufacturer’s future to shareholders.

The attraction was the interaction among disciplines. Mechanical, electrical and chemical engineering could meet in the same problem. Her eventual responsibilities would become broader, but that early interest offers a useful way into her career. The interesting question was how the parts behaved together.

A mentor, then a predecessor

John Wall was one of those parts of the story that no organizational chart could adequately explain. A Cummins technical leader and MIT graduate, he became a mentor to Rumsey. She would eventually succeed him as chief technical officer. Their relationship stretched back much further than the succession announcement.

As a teenager in Columbus, Rumsey had babysat his children. Years later, she was taking over his technical responsibilities. The anecdote is funny because the distance between the two jobs is so considerable. It is useful because mentorship becomes something concrete: a person who knew her early, encouraged her and helped her see work she might otherwise have placed beyond her reach.

The company she rejoined in 2000 gave her multiple vantage points. She worked in advanced controls, aftertreatment technology, product development and quality. Her assignments included technical program leadership and engineering responsibility for heavy-duty engines. Each job brought a different version of the same obligation: make the product work for the people who depend on it.

“I love solving tough technical problems, especially complex problems”Jennifer Rumsey, on her engineering work

In 2015, she became the first woman to serve as Cummins’ chief technical officer. In a conversation about the appointment, she described it as reaching her dream job. That matters when reading the later promotions. The technical post was an ambition in its own right, with responsibility for research and engineering across the business.

Her work also extended beyond the laboratory. She enjoyed understanding customers and business needs, then using that understanding to direct technical work. The engine, the application and the customer’s economics belonged in the same conversation. It was an education suited to the operating jobs that followed.

Learning the business at full scale

Rumsey went on to lead Cummins’ Components segment. It was a substantial operating assignment: more than 12,000 employees worldwide and $6 billion in sales in 2020. A technical decision there carried manufacturing, commercial and organizational consequences. The scale made the connections impossible to ignore.

During her leadership, Components introduced products for China’s National Standard VI and India’s Bharat Stage VI emissions requirements. She also served on the Eaton Cummins joint venture board and helped launch the Endurant transmission in China. These were specific products, markets and partnerships, rather than an abstract apprenticeship in management.

In March 2021, she became president and chief operating officer, overseeing global operations. Election to the Cummins board followed in February 2022. On August 1 that year, she succeeded Tom Linebarger as chief executive, becoming the seventh CEO since the company’s founding in 1919 and the first woman to hold the job.

Linebarger had been a mentor as well as a predecessor. Rumsey has recalled his advice to do a job in her own way. It is sensible advice with an awkward practical demand: accepting a larger responsibility without assuming that the previous occupant’s manner is part of the employment contract.

She added the chair role on August 1, 2023. The progression had taken her through technology, a business segment and operations. By then, the task was to decide how a company associated with diesel engines should invest in a future with several possible sources of power.

The future still has to make its deliveries

Rumsey helped develop Destination Zero, Cummins’ decarbonization strategy, alongside Linebarger. The underlying industrial problem is stubborn. Trucks, buses, trains and other working equipment must keep doing their jobs while the technology powering them changes. Customers have schedules, budgets and equipment already in service. An attractive future cannot excuse a missed delivery this afternoon.

Her first months as CEO included a visit to the IAA trade show in Hanover, Germany. There, Cummins presented improvements to engine-based technologies alongside alternatives, including batteries and hydrogen technologies. In her account of those months, she emphasized investing in employees as well as products. A company cannot change what it builds without helping people change how they build it.

That early period also included meeting high-school girls at the Cummins Engine Plant for International Day of the Girl. For someone whose own career had benefited from summer placements and encouragement, the encounter had a recognizable logic. Engineering becomes easier to imagine when someone can show you where the work happens.

Her tenure has also included a serious challenge to the company’s environmental credibility. In January 2024, U.S. and California authorities detailed a settlement over alleged emissions violations involving pickup-truck engines. It included a $1.675 billion civil penalty and more than $325 million in remedies. Cummins said it did not admit wrongdoing and had found no evidence of bad faith.

The agreements became effective in April 2024. Cummins’ subsequent annual filing recorded the associated obligations, including recalls, mitigation and compliance measures. For a company promoting cleaner power, those obligations sit beside the strategy. The engineering and governance requirements are inseparable from the credibility of the promise.

A company changes at more than one speed

The investment timetable has required adjustment, too. In reporting its 2024 results, Cummins recorded $312 million in fourth-quarter charges for reorganizing Accelera, its zero-emissions business. Rumsey explained that adoption of certain zero-emissions solutions had slowed in some regions. The company was narrowing its focus and streamlining operations.

By the second quarter of 2026, another demand was prominent: power for data centers. Cummins reported quarterly revenue of $9.5 billion, up 9 percent from a year earlier. Rumsey pointed to orders for standby data-center power and improving North American truck markets. The company raised its revenue outlook for the year.

She also joined 3M’s board in June 2026, with a seat on its Science, Technology and Sustainability Committee. The assignment brought her industrial experience into another company’s deliberations. At Cummins, meanwhile, the immediate decisions remained concrete: where demand was growing, where investment needed patience and where it needed restraint.

Room for another kind of engineer

Rumsey’s advocacy for women in engineering runs through the career rather than appearing only at its summit. She participated in the Society of Women Engineers at Purdue and later worked to encourage women into technical careers. Her point is practical: a field tackling difficult problems needs people who might otherwise never consider joining it.

The family version carries some gentle comedy. Her husband, Jim, studied electrical and computer engineering at Purdue. Both daughters chose mechanical engineering, her discipline. She has joked about his disappointment. The important parental instruction, however, was to pursue their own interests. A family can have an engineering tradition without issuing everyone the same specification.

That leaves Columbus with a different meaning from the place she once thought she wanted to leave. She returned for work that interested her, then kept finding larger versions of the problem. The student learned to study. The controls engineer learned products and customers. The technical leader learned operations. Now Rumsey has to make those experiences useful to a company changing what it makes, while its customers keep the world moving.