Andrew Picken Orr FRSE ARIC (1898–1962) was a 20th-century Scottish oceanographer and was an expert on phytoplankton and copepod biology.
[1] After the war he studied science at Glasgow University graduating with MA and BSc degrees.
In 1923 he became a chemist at the Millport Research Station and in 1929 was part of the Great Barrier Reef Expedition with Sheina Marshall,[2] subsequently working with her for around 40 years in total.
During the Second World War, they worked with Lillie Newton and Elsie Conway on sourcing of pharmaceutical agar from UK marine algae.
His proposers were Sir Maurice Yonge, Charles Wynford Parsons, Otto Lowenstein and James Wilfred Cook.