[1] In October, 2009 Rossetti stepped down from this position and in January 2010, joined the faculty of The Catholic University of America to teach in the School of Theology and Religious Studies.

In 1980, he entered the seminary, Theological College, at The Catholic University of America in Washington, D.C., where he earned a Doctor of Ministry degree.

[7] Rossetti has been an outspoken writer, lecturer and advocate for the importance of using the insights of modern psychology in collaboration with orthodox Catholic theology.

Rossetti believes understanding and integrating psychology and church teachings is an important task for Catholic ministers and psychologists.

Through his writings, workshops, research and participation in task forces, Rossetti has worked toward the prevention of child sexual abuse and raising awareness of the effects on victims.

He has also worked on developing more effective treatment and supervision of offenders and creating institutional policies promoting education and prevention efforts.

The group produced recommendations published by the USCCB's Secretariat for Priestly Life and Ministry saying, “We are concerned that the hierarchy’s authority and credibility in the United States is eroding because of a perceived inability to deal more effectively with the problem of child sexual abuse…We urge the bishops to respond to this tragedy decisively, pastorally, and immediately.”[9] Many of the recommendations were eventually adopted after the 2002 sexual abuse crisis erupted.

Rossetti was one of the original consultants in 1998 that helped develop the National Catholic Risk Retention Group’s child abuse prevention program called VIRTUS.

He was an expert adviser to the U.S. Catholic Conference of Bishop's United States Conference of Catholic Bishops Ad Hoc Committee on Sexual Abuse that drafted the 2002 Charter for the Protection of Children and Young People—commonly referred to as the “Dallas Charter.” He also participated in the April 2003 Vatican Symposium on child abuse sponsored by the Pontifical Academy for Life.

One of the study's conclusions was: “for the church to demonstrate to Catholics, especially parishioners of an accused priest, a swift, credible and concerned response to allegations of clergy misconduct.”[12] Shortly after becoming President of Saint Luke Institute in 1997, Rossetti instituted the policy of recommending to dioceses and religious orders that priests or religious, having sexually molested a minor anytime in the past, never be returned to any unsupervised work or contact with minors.

Rossetti was an invited speaker to the Gregorian University in Rome's international symposium on the sexual abuse of minors, which was attended by bishops and religious superiors representing the Catholic Church around the world.