In this Ohio.com article, Jake LeBarre of Davey's Akron, Ohio, office talks about caring for this historic tree.

It may be Akron’s most famous tree, but on a cold and rainy Arbor Day the Signal Tree was celebrating alone.
Almost.
Jake LeBarre, assistant district manager for the Davey Tree Expert Co., who has tended to the aging burr oak for almost 15 years, was there.
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The Davey Tree Expert Company provides research-driven tree services, grounds maintenance and environmental and utility infrastructure consulting for residential, utility, commercial and environmental partners in the U.S. and Canada. Established in 1880 and headquartered in Kent, Ohio, Davey has over 12,000 employees who create and deliver sustainable solutions. Davey continues to grow through expertise with the SEED Campus, its newest commitment to training, research and safety. Become part of the Davey legacy by applying today and join one of the top ten largest employee-owned companies in the U.S.