Mr O'Brien, the Irish Giant, the Tallest Man in

Mr O'Brien, the Irish Giant, the Tallest Man in the Known World, 1803. Patrick O'Brien (c1765-1804), the Irish giant, being measured for a suit by an Edinburgh tailor. O'Brien was 8 feet 7 inches (2.616m) tall. Such abnormal growth manifested by those suffering from Gigantism is caused by an over-active pituitary gland (endocrine system) producing an excess of growth hormone. Etching by John Kay

1803 Abnormal Caused Endocrine Excess Gigantism Gland Hormone Inches Manifested Measured Obrien Pituitary Producing Suffering Tailor Tallest

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