Born in Cincinnati, Ohio, he was the son of Augustine and Philamena (Detert) Lasance.

During the next seven years, Lasance served as curate in various parishes in the Archdiocese of Cincinnati including churches in Kenton, Reading, Dayton, Lebanon, and Monroe, Ohio.

He also served as chaplain at Our Lady's Summit, in East Walnut Hills, in Cincinnati.

Ill health forced him to relinquish parish work in 1890; from then on, he lived a "retired, semi-invalid existence" at St. Francis Hospital, Cincinnati, writing various books on spiritual subjects and serving as spiritual director of the Tabernacle Society.

He wrote thirty-nine volumes, including: He also compiled and edited the Blessed Sacrament Book (1913).