A: Anyone who by virtue of their baptism cooperating with the gift of the Holy Spirit is tasked with discipling "fishers of men" in the work of bringing the faithful and people of good will to encounter Christ both in sacramental preparation and mystagogy, unveiling the mystery of the person of Jesus Christ. In short, those who may lead parish discipleship efforts or train volunteers in the important work of witness, accompaniment, and of instructing others in the faith. 

"to make all men see what is the plan of the mystery … comprehend with all the saints what is the breadth and length and height and depth … know the love of Christ which surpasses knowledge … (and be filled) with all the fullness of God" -Ephesians 3:9 18-19

“In the building up of Christ’s Body various members and functions have their part to play. There is only one Spirit who, according to his own richness and the needs of the ministries, gives his different gifts for the welfare of the Church” (LG 7). By virtue of Baptism and Confirmation, Christians are incorporated into Christ and participate in his office as priest, prophet, and king (cf. LG 31, AA 2); they are witnesses to the Gospel, proclaiming it by word and example of Christian life; but some “can also be called upon to cooperate with Bishops and priests in the exercise of the ministry of the Word.”1 In the multiplicity of ministries and services with which the Church realizes her mission of evangelization, the “ministry of catechesis” occupies a significant place, indispensable for the growth of the faith. This ministry provides an introduction to the faith and, together with the liturgical ministry, begets children of God in the womb of the Church. The specific vocation of the catechist therefore has its root in the common vocation of the people of God, called to serve God’s plan of salvation on behalf of humanity.”

    - Directory of Catechesis #110