David Sims, President of Tree Preservation, has worked throughout Los Angeles as a successful Certified Arborist since 2001. David purchased Tree Preservation Inc. in 2001 from McCullough's Tree Care, an existing arboriculture firm in business since 1986 in Los Angeles. To this date, there are key employees that have served our clients for more than 32 years! Since childhood, David has been actively involved in landscaping and gardening work on properties ranging from individual homes, commercial properties to large private and public golf courses.