St. Paul instructed the gathered community "Welcome one another, then, as Christ welcomed you, for the glory of God." (Rom. 15:7)
The role of the usher/greeter is one of offering a friendly, welcoming presence to those coming to worship, of providing leadership during emergencies and performing such tasks as taking up the collection, presenting the gifts, assisting parishioners during Communion, disseminating the church bulletin and participating in cleaning the church after completion of the Mass.