In the early days of the church bishops preserved the unity of the local churches with the universal Church through gathering regionally in episcopal synods. Episcopal synods is a representative body of bishops assembled periodically by the pope to advise him on important church concerns.
Second Vatican council
The Second Vatican Council reemphasized the bishop’s role as teacher and pastor confirmed through the fullness of the Sacrament of Holy Orders. The college of bishops exists for the purpose of preserving the unity of the universal Church. The whole college shares with the pope authority over the whole Church which is episcopal collegiality.
Arch Diocese of Miami
The archbishop of Miami is Thomas Wenski. He was appointed archbishop April 10, 2010 by Pope Benedict XVI. An auxiliary bishop is a bishop assigned to assist the diocesan bishop in meeting the pastoral needs of the diocese. Peter Baldacchino has served as the Auxiliary Bishop of Miami since 2014.