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Mary Helen Johnston Height

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Mary Helen Johnston (born September 17, 1945), later also Mary Helen McCay, is an American scientist and former astronaut. Working with NASA as an engineer in the 1960s and '70s, Johnston aspired to be an astronaut; she unsuccessfully applied in 1980 before becoming a payload specialist in 1983.

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Visible height is how tall the person appears to you, including footwear, hairstyle and proportions. It's about overall impression.

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Peak barefoot height is your estimate of the person’s tallest adult height before any age-related height loss.

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