While a graduate student at the University of Notre Dame, he taught undergraduate courses in the Theology Department and was assistant rector of Grace Hall.
In 1984, McGinniss joined the faculty at La Salle on a full-time basis, eventually reaching the rank of full professor in 1993.
Under his leadership undergraduate enrollment and retention rates were increased; a Graduate Education Program was established; the Athletic Department joined the NCAA Division II Gulf South Conference; new residence halls were constructed; enhancements were made to science labs and facilities; the school's Engineering departments were re-accredited; an upgrade of information technology systems throughout the campus was implemented; and the Center for Global Enterprise was founded.
For many years, he has lectured to a variety of academic and professional groups on issues related to spirituality, pastoral care, and theology.
[2] Under McGinniss' direction, La Salle University had developed a new strategic plan and significantly increased enrollment, giving, and alumni involvement.
Under his leadership, La Salle underwent significant expansion; it began construction of a new business school, dormitories, dining halls, and other resources.
The legacy of McGinniss' strategic plan remains ambiguous after his successor was left with a large deficit and faltering credit rating.