Jason Laffen


Jason has been in the landscape business for over 20 years. Shortly after he joined Keenan & Sveiven 16 years ago, there was no doubt in his mind that this company was a great fit. That is as true today as it was then.

Jason’s quality workmanship and thorough planning have allowed him many opportunities to work closely on projects with great clients, trusted subcontractors and skilled crews. He strives for perfection with every construction detail. He often can be heard saying “Clients trust our company to plan and execute their vision. It is my passion to see their dreams realized and to exceed their expectations. I find great satisfaction in that!”

Ashley Laffen

Vice President/Director of Business Administration

After completing her bachelor’s degree in business marketing, Ashley gained professional experiences in many areas of business including management and human resources.  As a new owner, Ashley officially joined the team in February 2024.  She is excited to bring her business experience and enthusiasm for people to this talented team to support, nurture and build into the future at Keenan & Sveiven.

Kevin Keenan

design principle

Co-founder of Keenan & Sveiven Inc., Kevin has over 30 years of landscape design experience in the Twin Cities and surrounding areas. Kevin is a 1981 graduate of the University of Minnesota School of Landscape Architecture. He is the design principle at Keenan & Sveiven, a resource that architects, builders and homeowners recognize as a preferred landscape firm to call upon.

Todd Irvine
Landscape Architect

A native of the Chicago area, Todd worked summers in his youth at a small nursery near his home planting and tending crops for landscape use. From there, he developed his professional landscaping experience by working as a landscape architect at several reputable firms across the Midwest. A graduate of Iowa State University in Ames, Iowa, Todd’s portfolio includes 30 years leading teams on commercial and high-end residential projects. His penchant for insightful design, careful planning and exacting execution has earned him a first-rate reputation among clients in the Twin Cities area.

Bob Wallace
Landscape Architect

An award-winning landscape designer, Bob is a graduate of the University of Minnesota School of Landscape Architecture. Bob was first drawn to landscaping and architectural design after working his way through school, first at a nursery and then in an architecture firm. He is experienced with everything from the challenges of small spaces to the expanses of large estate projects. Bob has a passion for meeting client expectations by delivering landscape designs that reflect the unique character of individual outdoor spaces and managing all aspects of the project.

Tiffani Navratil, PLA

Landscape Architect and Project Manager

Minnesota-native with a love of global travel, Tiffani finds inspiration from a wealth of resources such as geology, ecology, architecture, and art. Living abroad provided her with a unique perspective which inspires her design work and her 15+ year teaching career as an adjunct faculty member at both the University of St. Thomas and the University of Minnesota’s College of Design. Tiffani’s commitment to excellence in design and project execution, transforms client vision into reality.

John Johnson
Landscape Architect (ret.) – Design Support

Surrounded by the lakes and rivers of his native Otter Tail County, John’s appreciation of the sounds, colors and textures of Minnesota’s natural beauty has only grown with his success as a landscape architect and designer. John is a graduate of ISU in Ames, IA where he earned a Bachelor of Landscape Architecture. His project book includes site design and development of high-end residential, commercial, residential subdivisions, golf courses, water features and custom amenities. From broad-stroke conceptual planning to graceful structures, he skillfully executes the intricate details essential to careful and thoughtful projects


Born and raised in Northfield, Minnesota, Stacy grew up surrounded by rolling meadows, the Cannon River and wooded hillsides. She has a Bachelor of Science in Industrial Technology with an emphasis in Model Making from Bemidji State University. Her experience in design and rendering combined with a love of the outdoors fits well with the design/build rhythm of custom landscape architecture. Stacy enjoys seeing quality materials and unique designs take shape and enjoys hearing customer enthusiasm as those projects become real. Stacy’s work history includes industrial production, environmental design, and landscape design for firms in New York, Wisconsin and Minnesota.

Becky Miller
Operations/Office Manager

More like Awesome Manager, Becky has 20 years of experience in the landscape industry, over 17 with Keenan & Sveiven. Prior to landscape, Becky was involved in public school administration and coaching. No wonder everything runs smoothly behind the scenes!

Ann Zimmer


Ann has served Keenan & Sveiven in the bookkeeping role for the past 29 years. Her sphere includes accounts payable, accounts receivable, financial reporting, banking and tax work.