Marjorie Lee Senechal (née Wikler, born 1939) is an American mathematician and historian of science, the Louise Wolff Kahn Professor Emerita in Mathematics and History of Science and Technology at Smith College and editor-in-chief of The Mathematical Intelligencer. In mathematics, she is known for her work on tessellations and quasicrystals; she has also studied ancient Parthian electric batteries and published several books about silk.
Senechal was born in St. Louis, Missouri, the oldest of four children of Abraham Wikler, a United States Public Health Service physician. The family soon moved to Lexington, Kentucky, and Senechal grew up as a "narco brat" on the grounds of the Lexington Narcotic Hospital, a prison farm for drug addicts, where her father was associate director. She was educated at the Training School of the University of Kentucky, a small school with only one class in each grade; Senechal later wrote that the school's too-easy classwork, snobbish classmates, and anti-Jewish discrimination made her miserable.
She left Lafayette High School after the 11th grade to begin her undergraduate studies as a pre-med at the University of Chicago, but soon switched to mathematics, graduating in 1960. While doing graduate studies at the Illinois Institute of Technology, she married mathematician Lester Senechal, and moved to Arizona with him before completing her own degree. Nevertheless, she finished her Ph.D. in 1965, under the supervision of Abe Sklar; her thesis concerned functional equations.