Thesis Pieces by Ambassador (The Cross Movement) from the album The Thesisbr br William Tyrone[1] "Duce" Branch a.k.a. The Ambassador or Ambassador is a Christian hip-hop artist who has recorded both independently and as a founding member of the group The Cross Movement.[2][3] Branch is the former president of Cross Movement Ministries. He is an alumnus of Dallas Theological Seminary and has a Master in Theology degree graduating with honors.