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roen hohlfield, MLA, ISA CA

landscape designer, Ecologist

Roen is a landscape designer and ecologist dedicated to creating aesthetically-pleasing designs that restore environmentally critical areas. He applies his 10 years of experience in wetland science and stream ecology, landscape architecture, environmental policy, and construction project management to help public and private clients meet regulatory requirements and develop sustainable solutions to their project needs. Prior to joining Watershed, Roen owned and operated his own landscape design firm and interned as a water quality field scientist for King County’s Department of Natural Resources.


  • Master of Landscape Architecture, 2010, University of Washington

  • BS, Environmental Science and Management, 2001, University of Michigan


  • Wetland Science and Management Certificate, 2015, University of Washington

  • AutoCad Certificate, 2012, Seattle Central Community College

  • Certified Arborist, International Society of Arboriculture (ISA), No. PN-8562A, Exp. 06/2021