Louis Sidney Mason quietly transitioned to life eternal at his residence in La Plata, Maryland on December 3, 2016. Viewing, 10:00 am until time of service, 12:00 noon, Saturday, December 10, 2016 in the Chapel of Thornton Funeral Home, P.A., 3439 Livingston Road, Indian Head, Maryland 20640. Arrangements by Thornton Funeral Home.