Sam Kass, ex-White House chef and current climate advocate

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Sam Kass and Michelle Obama take part in the groundbreaking of the White House Kitchen Garden on the South Lawn in 2009 © Win McNamee/Getty Images

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Sam Kass harvests and weighs vegetables from the White House Kitchen Garden with elementary school students in 2009 © Win McNamee/Getty Images

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Michelle Obama shops for fresh produce with Sam Kass at the opening of a new farmer's market two blocks from the White House in 2009 © Win McNamee/Getty Images

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Sam Kass at a White House event in 2010 © Alex Wong/Getty Images

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Sam Kass with Michelle Obama after planting the White House Kitchen Garden on the South Lawn in 2013, event attended by schoolchildren © Win McNamee/Getty Images

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Sam Kass with Barack and Michelle Obama during an event to harvest the White House Kitchen Garden in 2016. Guests included Sesame Street characters © Chip Somodevilla/Getty Images