Full HD Video: Fr. Gabriel Thomas Mosher, O.P,’s 1st Mass at St. Margaret Mary (Oakland, CA) Posted on June 16, 2015 by Sancta Trinitas Unus Deus 0 Full HD video of Fr. Gabriel Thomas Mosher, O.P.’s First Mass of Thanksgiving (Solemn High Mass) at St. Margaret Mary’s (Oakland, CA) last June 14, 2015. Share this:TwitterFacebookEmailLike this:Like Loading... Related