Ken Langston

Project Manager/Estimator (Since 2001)

Ken regularly attends industry conferences and seminars to keep abreast of new technologies, green building methods and he’s trained in L.E.E.D. projects. He’s practiced at Chief Architect, knowledgeable in flat roofing products and has worked with local historical societies on historic buildings. He’s very active with Ducks Unlimited and he and his wife and children enjoy camping, hunting and fishing.

Jeff Koch

(Since 1980)

Jeff brings over 35 years of experience and a hands-on approach to every project to ensure customers are more than satisfied with the finished product. He takes great pride in the craftsmanship, work ethic, and professionalism of all members of his team. He and Brenda have a daughter, son-in-law, and two grandsons in Houston. Their oldest son has joined the business at Koch Construction, and their youngest son attends Iowa State.

Carrie Buschmann

Designer/Project Manager/Estimator (Since 2002)

I’m a designer, a project manager and an estimator. Yes, I do everything for your project except actually build it. I see your project from start to finish; from drawing your ideas and consulting on product choices to scheduling and coordinating our carpenters and installers. You can count on me to get your job done, and done right!

Karl Koch


Karl was born in the United States but raised in Denmark, returning to the U.S. at age 25. He’s still active with the company he started in 1980, reporting to the shop most mornings to see how he can contribute to the day’s projects. When he’s not working on Koch Construction jobs, he’s building items for community fundraising auctions. He also enjoys history, reading, horses, and of course, his grandchildren and great-grandchildren.

Mark Koch

Project Manager/Estimator (Since 1989)

Mark has spent his entire career in the construction industry, from the lumberyard to finished homes. He enjoys the broad range of projects handled by Koch Construction and the opportunity to sweat the details so customers don’t have to. Mark and Merri have three adult children, a son-in-law, and one grandson. Mark enjoys fitness, bicycling, and canoeing.

Brad Becker

Lead Man (Since 2004)

Brad's artistic abilities enhance his fine craftsmanship. His organization skills and enviable disposition make him a pleasure to have on any project. Brad farms his parents' century farm, raises beef cattle, and enjoys indoor and outdoor sports and activities.

John Everman

Lead Man (Since 1984)

John brings his uncanny troubleshooting and problem solving abilities to remodeling projects. He’s IRCA certified in both low-slope and steep-slope roofing. John has said he’d be happy fitting ornate moldings full time, but he enjoys spending time on the Cedar River with his children and four grandchildren too.

Ryan Maltas

Lead Roofer and Carpenter (Since 2007)

You won’t have any trouble getting a word in edgewise with Ryan, but don’t let his stoicism fool you, he knows his stuff and brings a strong work ethic to his projects. He has a son named Kaleb and they enjoy outdoor recreation, sports, karaoke, and watching movies.

Justin Manifold

Lead Man (Since 1992)

Justin has been with Koch Construction since 1992. With that experience and his second-to-none analytical skills, he knows how to put a project together or resolve existing conditions. He’s a project manager who ensures your project is delivered on time, on budget, and with the highest standards of quality. Justin takes a lot of pride in providing you with the peace of mind that comes from knowing you’re working with the right team on your project.

Kyle Shock

Lead Carpenter and Roofer (Since 2013)

The Koch’s met Kyle through scouting where Kyle earned the Rank of Eagle Scout. Kyle worked in manufacturing out of high school. When he was ready to return to his hometown he joined Koch Construction. Kyle has developed in to an all-around carpenter and roofer leading many projects on his own. Kyle enjoys the outdoors, hiking, hunting, fishing, camping, and frisbee golf. He and his sweetheart who he met while working at HyVee in high school reside in Waterloo with their dog Ellie.

Oksana Gray

Carpenter (Since 2016)

Oksana began her career as a carpenter following high school graduation in Ohio. She worked her way up to a journeyman in the union, where she gained experience in all facets of residential and commercial construction. Now, with nearly a decade of experience, she plays a key role in many of the projects taken on at Koch Construction. Watch out for her on the jobsite - she brings a strong work ethic and a real sense of urgency with her each day. When she's not practicing her craft as a carpenter, Oksana enjoys spending time with her niece, playing with her great dane, and time spent boating on the Cedar River.

Susan Hoeg

Accountant/Office Manager (Since 2017)

Susan manages the front office and takes care of accounting. Her upbeat demeanor is familiar to those who have called our office or walked into our showroom. She enjoys listening to the needs of our customers to find out how we can best serve them. Susan enjoys the outdoors and family time with her husband and their son.

Tim Funk

Carpenter (Since 2019)

Tim grew up in Evansdale, Iowa. He enjoys spending time fishing and camping at Hickory Hills State Park with his family. Even though Tim has only been with the company since September 2019, his hard work and determination has not gone unnoticed. Tim has been working for us as a carpenter and enjoys woodwork and kitchen remodels.

Rachel Krebsbach

Designer (Since 2019)

Rachel started with Koch Construction in 2019 as an intern. As a graduate from the University of Northern Iowa with a degree in Interior Design, she is now able to help our clients full-time be able to visualize what their dreams would look like in their home.

Alex Westrum

Carpenter (Since 2020)

Alex grew up in Stratford, Iowa and has been with Koch as a Lead Carpenter since May 2020. His favorite type of job to work on is remodels because he enjoys seeing a space transform from beginning to end. Before coming to Koch, Alex worked as a carpenter and traveled with Disney Live for 3 years, traveling to 4 continents, 11 different countries, and building sets in 100's of different theaters around the world!

Nate Hesnard

Carpenter (Since 2020)

Nate recently joined the Koch Construction team as a carpenter. His favorite part of the job is finish work. He grew up in Bradford, Iowa, which only has a population of 90! He had his first job as a farmhand at the age of 13. Nate is married and has a son as well as 4 dogs, 2 cats, and 9 fish.