We don’t normally allow guide recommendations on this website, but this one from Addis Eats’s Eliza Richman, a co-author of the Bale Mountains NP guide booklet, is worth including:
I wanted to recommend Muzeyen as a guide for the Bale Mountains. I’ve travelled with him several times and he’s so knowledgeable, kind and hard working (and funny!) He’s always arranged everything for us before we even arrive and is an unbelievable guide in the park. He used to work with the Ethiopian Wolves so he knows their territories very well. You can see more information about him on his website: https://trekethiopia.org/ or you can reach him directly at 251 913 28 25 97 or at firstname.lastname@example.org.