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SSMEs are produced by Aerojet Rocketdyne. In 2015 their CEO abruptly resigned.
"Scott Seymour, president and chief executive of Aerojet Rocketdyne, abruptly retired from the company June 1 and has been replaced by an executive who joined the company only three months ago.
Neither the 64-year-old Seymour nor the company offered an explanation for his sudden retirement, announced by the company June 1. According to a filing with the U.S. Securities and Exchange Commission June 1, Seymour announced his intent to retire May 29. “Seymour’s resignation was not the result of any disagreement related to any matter involving the Company’s operations, policies or practices,” the filing stated."
Source: spacenews.com/an-abrupt-departure-for-aerojet-rocketdyne-ceo/