Our Expert Crew

Team Lead and Owner

Kathy Holzer is an ISA Certified Arborist (PN-0956A) and a TRAQ Qualified Tree Risk Assessor with 26 yrs of experience climbing, pruning, and assessing trees in the Seattle area. Though she rarely gets to work in the field any more, Kathy was also five-time PNW chapter climbing champion and the 2004 world champion climber at ISA ITCC in Pittsburgh, PA. She has a BA in philosophy from Bowdoin College in Brunswick, ME and is currently studying for the ISA’s highest level of certification – BCMA, or Board Certified Master Arborist.

Kathy is an avid reader, studied Aikido for 20 years, and shares a 1928 “fixer” she bought for the big trees on the lot with her lovely partner Levecke.


Office and Operations Manager

Levecke MasLevecke Mas is proud to join Out on a Limb Tree Co, and support such an awesome crew, and she is not just saying that because she happens to be married to Kathy. She brings over fifteen years experience in front office management to the daily operations of the company, enjoys working with spreadsheets, loves keeping track of details and talking to people.

When she’s not working in the office or doing the crossword puzzle with Kathy, she enjoys walking, hiking, riding her bike and traveling as much as possible.


Crew Lead

Karsten Foerster

Karsten Foerster is an ISA Certified Arborist (PN-7911A), is a TRAQ Qualified Tree Risk Assessor, our crew lead, and has been working in tree care since 2013. Prior to tree climbing, Karsten served a five year enlistment in the United States Marine Corps as a helicopter structural mechanic. Karsten now enjoys using his attention to detail and strong work ethic towards caring for customers’ trees. In his free time he enjoys fly fishing and backpacking.


Job Lead

George White headshotGeorge White is an ISA Certified Arborist (PN-8908A) and is a TRAQ Qualified Tree Risk Assessor. George is a Seattle local who has been working in tree care since 2016. After graduating from the University of Oregon with a BS in Environmental Science and Biology, he discovered how to combine his passion for climbing with his love for forest ecology through arboriculture. In his free time he enjoys playing in the mountains, printmaking, and making music.


Job Lead

Dilifera Manantsoavina headshotDilifera (Dilphe) Manantsoavina is originally from Madagascar, where he worked as a tree climber leading tourists and scientists up baobabs and into rainforest canopies. After moving to the US, Dilphe worked in landscaping in upstate New York and Seattle, but missed working with trees. He is happy to now be working with Out on a Limb and learning to care for the native trees in the NW. Winter or summer, when not at work Dilphe will most likely be found at the water’s edge, fishing and enjoying nature.


Team Member

David Suttle headshotDavid Suttle’s love of trees grew as a child while building neighborhood tree-houses and climbing his grandfather’s meticulously pruned Magnolia trees in Fort Worth, Texas. With a thirst to explore, David spent time Living in Santa Fe, New Mexico and Northern California before setting roots in Seattle and couldn’t be happier. While working as a landscaper David decided to follow his passion and focus on tree care, becoming an ISA certified arborist (PN-8825A). When David isn’t working with the Out On A Limb team he enjoys cooking for his wife, camping trips, and exploring the PNW on his motorcycle.


Team Member

Andrew Haggerty headshotAndrew Haggerty is so happy to be a part of the OOL crew. He grew up in the Seattle area and has always found a great appreciation for the natural beauty the area has to offer. Andrew is new to the world of tree care and is extremely excited to grow his skills and knowledge. When not at work Andrew can be found exploring local parks and hiking trails or reading a good book.


Team Member

Landon Jackson headshotLandon Jackson is originally from Portland, Oregon where he grew up frequenting the green expanses of Forest Park and Oregon forests. After graduating from Western Washington University with a BA in Urban Planning and Sustainable Development, his passion for ecological systems and urban forestry led him to join on as a member of our ground crew. When not at work, he enjoys skateboarding, building bikes, and camping. He looks forward to learning more about tree care, and building experience towards ISA certification.


Team Member

Harlequin headshotHarley is half Australian cattle dog (“blue heeler”) and half German shorthair pointer, and joined the team at the ripe old age of 8 wks in February 2017. She is very excited to pull her own weight as a member of the team, but we suspect it won’t happen at least until she gets her adult teeth.