An octogenarian Swiss billionaire who makes his home in Wyoming and has donated hundreds of millions to environmental causes is a surprise new player in the bidding for Tribune Publishing, the major newspaper chain that until recently seemed destined to end up in the hands of a New York hedge fund…

Hansj√∂rg Wyss, the former chief executive of the medical device manufacturer Synthes, said in an interview on Friday that he had agreed to join with the Maryland hotelier Stewart W. Bainum Jr. in a bid for Tribune Publishing, an offer that could upend Alden Global Capital’s plan to take full ownership of the company.

Mr. Wyss, who has given away some of his fortune to help preserve wildlife habitats in Wyoming, Montana and Maine, said he was motivated to join the Tribune bid by his belief in the need for a robust press. “I have an opportunity to do 500 times more than what I’m doing now,” he said.

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