
Born: August 8, 1854, Rancho del Rosario, Hidalgo County, Texas.
Died: December 19, 1938, Montemorelos, Nuevo León, Mexico.
Buried: Montemorelos, Nuevo León, Mexico.

Leandro was the son of Pablo de la Garza and Maria Josefa De La Luz Mora Garza. His father died when he was five years old. Leandro married three times: to , Carmen O. Garza, Leonor Marroquin, and Cármen Leal.
He came to Christ around age 20, under the influence of Dr. Antonio Tomas Graybill. At the time, he was working as a bartender in Matamoros, Mexico.
He eventually started theological studies and served as a Presbyterian minister for seven decades.