Hello,
Generally I would refer this to the forester for the Chippewa Conservation District, and that position is now vacant. 
I can talk to him, but not visit. 
Below is a list of consulting foresters ordered by the county in which they serve:
https://www.michigan.gov/-/media/Project/Websites/mdard/documents/environment/forestry/directory_of_qualified_foresters_by_county.pdf

Below is a list of oak wilt qualified professionals (not sure if he is concerned with oak wilt - or?)
https://www.michiganoakwilt.org/oak-wilt-qualified-vendor-directory

I hope one of those options works for him. 

Thank you,
-Julie