Brevet Colonel Sir Samuel Rickard Christophers CIE OBE FRS[1] (27 November 1873 – 19 February 1978[2]) was a British protozoologist and medical entomologist specialising in mosquitoes.

In 1910 he was appointed the first Director of the Central Malaria Bureau, coordinating anti-malarial training and research throughout India.

He spent World War I on anti-malaria duties in Iraq and in 1919 returned again to India as Director of the Central Research Institute at Kasauli in the foothills of the Himalayas.

He is the friend, philosopher and mentor of all keen young men of science[8]' He died at Broadstone in Dorset.

Their first child, Elise Iseult, was born in June 1903 in Allahabad, India, and their son, Samuel Vagn, in December the following year in Madras.