| tree and garden experts

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About Us

Treage LLC ~ Tree and Garden Experts was formed in 2017 and is co-owned and operated by Sebastian Koerber and Alison Walker. Both Sebastian and Alison formerly worked for Robert Brennan Consulting in Miami, FL and went on to combine their knowledge, skills and experience to form Treage LLC, which offers an expanded range of arboricultural and horticultural services. 


Sebastian Koerber

Sebastian is a German born and educated Board Certified Master Arborist with more than 20 years of experience in the field of arboriculture. He holds the highest credentials for arborists in Germany, the EU, and the USA and is Tree Risk Assessment qualified by the International Society of Arboriculture. Sebastian has consulted for municipalities, golf clubs, and tree expert companies, and has assisted and conducted trainings for arborists nationally and internationally. His focus is on the preservation of urban trees through sustainable management, best practices, and state of the art diagnostic equipment and methods. 

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Alison Walker

Alison is a certified arborist and experienced horticulturist with more than 20 years of experience in plant science. She received her Bachelors degree in Plant Protection and Nursery Management, and her Masters Degree in Entomology with a focus on Integrated Pest Management (IPM). She has worked in a variety of settings, including laboratory, field, greenhouse, nursery, botanic garden, residential gardens, and K-12 and college classrooms. She has taught as an adjunct horticulture professor and has presented to national and international audiences on various aspects of organic gardening, ethnobotany and integrated pest management.