Louis Lapicque (1 August 1866 – 6 December 1954) was a French neuroscientist, socialist activist, antidreyfusard and freemason who was very influential in the early 20th century. One of his main contributions was to propose the integrate-and-fire model of the neuron in a seminal article published in 1907. Today, this model of the neuron is still one of the most popular models in computational neuroscience for both cellular and neural networks studies, as well as in mathematical neuroscience because of its simplicity. A review article  was published recently for the centenary of the original Lapicque's 1907 paper - this review also contains an English translation of the original paper).
His wife, Marcelle de Heredia Lapicque, was also a neurophysiologist. Louis Lapicque "insisted on the importance of his wife as equal co-worker in all his research".