Grenardo is a Professor of Law at St. Mary’s University School of Law. He teaches Professional Responsibility, Contracts, Sports Law, Business Associations, Civil Procedure, and International Sports Law. He has presented on professionalism and ethics multiple times locally, statewide and nationally, including at the American Bar Association’s Annual Meeting and the ABA’s Annual National Conference on Professional Responsibility. He has also been quoted in the ABA Journal on the topic of civility. He practiced law in California and Texas for three large law firms for nearly a decade before joining the legal academy in 2011.

He represented clients in a wide variety of complex commercial litigation matters, including contract, tort and product liability cases. He dedicated a significant part of his practice to pro bono work, which included protecting the rights of, among others, domestic violence victims, the developmentally disabled and First Amendment litigants. He has received numerous awards for his pro bono efforts, including the Frank J. Scurlock Award, awarded by the State Bar of Texas, the Harriet Buhai Center for Family Law Pro Bono Panel Volunteer of the Year, the Wiley W. Manuel Award bestowed by the State Bar of California, the San Diego Volunteer Lawyer Program Distinguished Service Award, and Texas Civil Rights Project Pro Bono Champion.