Back surgeon turned inventor Gary Michelson is another sunset philanthropist.

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Walking around a city animal shelter in west Los Angeles with Gary Michelson is like doing rounds at a hospital where the doctor knows every patient.

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Four years ago Medtronic Sofamor Danek, the unit under investigation for kickbacks, sued spinal surgeon Gary Karlin Michelson and Karlin Technology, the company he founded, after he shopped around inventions--threaded and nonthreaded implants to stabilize spinal vertebrae--Medtronic claimed to own or have exclusively licensed.

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