Every Kiewit career tells a story, shaped by people, projects and experiences.
Five employees who have been with the company for more than 20 years reflect on what has made them stay and what continues to make the work meaningful. They share lessons passed down by mentors, stories about teams that felt like family and opportunities that helped them grow. There’s pride in building things that matter — and in knowing they play a role.
Robin O’Callaghan, Sebastien Marcoux, Glenn Miltenberger, Kari Larsen and Butch Miller have all built long careers at Kiewit because the work kept challenging them and the people they worked with and met along the way made it worth it.
Robin O’Callaghan
24 Years of Service | Design Engineering Manager
Robin O’Callaghan helped design and implement Kiewit’s original engineering toolboxes — a system still used across the company today.
Robin O’Callaghan first interviewed with Kiewit as a graduating senior from Iowa State University. She didn’t expect it to be a career-defining moment, but as she walked the halls, something stood out.
She noticed photos pinned up in cubicles — snapshots of people at team events, laughing and working together. The energy felt different.
That day, a snowstorm rolled in and delayed her trip home. The team advised her not to drive back to Iowa, arranged a hotel for the night and invited her to dinner — a clear reflection of how seriously Kiewit takes safety and how quickly the team made her feel part of it.
She joined the company in 2001 and has since taken on opportunities in estimating, engineering, business development and project execution. She helped build out engineering systems and took on strategic leadership roles in the industrial and nuclear markets.
“I’ve had mentors who saw what I was capable of, even before I did,” she said. That support gave her the confidence to keep saying “yes” to the next opportunity.
When asked why she stayed, O’Callaghan didn’t hesitate. “Why would I leave?”
Sebastien Marcoux
28 Years of Service | Design Area Manager
Sebastien Marcoux supported the Waaban Crossing project, formerly known as Kingston Third Crossing, which spans the Cataraqui River in Kingston, Ontario. It was the first bridge project in North America delivered using the Integrated Project Delivery (IPD) model.
Sebastien Marcoux started with Kiewit in 1997 as a planning engineer in Eastern Canada. One of his first assignments took him to Puerto Rico — and it set the tone for the rest of his career.
“There was always something new to take on,” he said. “That’s what kept it interesting.”
From hydroelectric and highway projects in Quebec to bridge work in Ontario, Marcoux steadily built experience. He also moved between roles in operations, estimating and design. Now based in Montreal, he supports large pursuits and alternative delivery projects throughout North America.
“I’ve worked with a lot of strong teams over the years,” he said. “What stands out are the collaboration and the support. You never succeed on your own.”
His advice to others is direct: “Take charge of your career. Don’t wait for the next opportunity to show up. Go after it.”
For Marcoux, staying has never meant standing still. “The people and the projects — that’s why I stayed. That’s what still gets me excited.”
Glenn Miltenberger
30 Years of Service | Area Manager
Known as a mentor to many, Glenn Miltenberger has developed craft and frontline leaders throughout his 15 years leading the training program.
Glenn Miltenberger was looking for the next step in his career when he joined Kiewit. What he found was a company that offered stability and one that would shape the way he leads today.
In the early years, Miltenberger and his wife moved often — from Maryland to California, to Tennessee and Illinois, to Kentucky and back again. Their two sons grew up in the back seat of a Kiewit truck, learning the names of projects their dad worked on. Later, they found careers of their own. One of them even worked at Kiewit.
As Miltenberger’s experience deepened, so did his role in developing others. He began training and coaching other superintendents — eventually helping build the foundation for Kiewit’s frontline leadership programs.
“I’ve been fortunate enough to have mentored, coached and helped a lot of people within Kiewit,” he said.
Today, he leads the superintendent training program in Lenexa, Kansas, and still visits jobsites regularly. He believes in passing down what he’s learned and not holding anything back.
“I’m not stingy with information,” he said.
Kari Larsen
31 Years of Service | Area Manager
Kari Larsen joined Kiewit as an apprentice pile driver and held roles from superintendent to area manager over her 30-year career.
Kari Larsen started at Kiewit as a craft worker on a water treatment project in Richmond, California. Since then, her work has taken her to jobsites across North America, each one challenging her in new ways.
One of her early assignments was a small pump station job in Louisiana, her first time working out of state. The conditions were unfamiliar, and the team was diverse with various backgrounds and their own ways of working. It was a young crew, and Larsen had to learn to adapt fast.
Later, she took a remote camp job in northern Alberta.
“That was tough for lots of different reasons,” she said. “You go from hot, sticky, humid down in the South to cold, frozen tundra in Canada.”
Both jobs pushed her to grow and played a key role in shaping the leader she is today.
Now an area manager in Northern California, Larsen focuses on project delivery and helping her teams navigate complex scopes. What continues to motivate her is seeing the work come to life.
“It’s just a really good feeling to be able to drive past a project and say, ‘Hey, I built that,’ or ‘I was part of that.’”
Butch Miller
37 Years of Service | Construction Manager
Butch Miller (left) and his team accepted the national Associated Builders and Contractors Eagle Award in 2000, recognizing project excellence and safety performance.
Butch Miller began his career in 1988 with TIC – The Industrial Company, building power plants across the West.
When Kiewit acquired TIC in 2008, it marked a shift — introducing Miller to a broader perspective on how his work fit into the bigger picture.
“That was really my first lesson,” he said. “Don’t underestimate what you think your small part of the world is compared to the larger part of the corporation.”
That mindset carried into the work that followed, including Cove Point LNG, a large-scale export facility on Chesapeake Bay in Maryland. As a liquefaction area manager, Miller helped oversee utility and power scopes across one of the most technically demanding sections of the job.
Now based in Houston, he focuses on cost and schedule planning. He’s no longer in the field, but he stays close to the people and culture that shaped him.
“If you work hard and show what you can do, you’ll be trusted with more,” he said.
