The firm started in 1925 under the name of Harold S. Irwin. In 1954, Harold S. Irwin, Jr. came into the practice with his father and Irwin & Irwin law firm was
established. In 1956 Roger B. Irwin joined the firm with his father and brother at which time the firm became known as Irwin, Irwin & Irwin. The name stayed the same until
1986 when Marcus A. McKnight, III became a partner and the name of the law firm was changed to Irwin, Irwin & McKnight.
The firm is currently known as Irwin & McKnight, P.C., reflecting the names of its founders and the current majority shareholder, Marcus A. McKnight, III.
Matthew A. McKnight became an associate with the law firm after his graduation from Pepperdine University School of Law in 2004. Stephen L. Bloom merged his former solo practice into the firm in 2007, and he is currently the elected Pennsylvania State Representative for the 199th Legislative District.
Support staff includes a real estate paralegal, an estate paralegal and four administrative assistants.
 MARCUS A.
McKNIGHT, III, ESQUIRE
Mr. McKnight is the majority shareholder of the Carlisle Pennsylvania, law firm of Irwin & McKnight, P.C. Mr. McKnight grew up in York County, Pennsylvania
where he graduated from Dallastown Area High School in 1970. He received
his undergraduate degree in 1974 from Drew University of Madison, New
Jersey, cum laude with specialized honors in economics and his Juris
Doctor in 1977 from the University of Pittsburgh School of Law. Mr.
McKnight is admitted to practice law before the Supreme Court of
Pennsylvania and the United States District Court of the Middle District
of Pennsylvania. His areas of practice are estate planning, family
law, litigation, real estate and municipal law. He is a member of
the Pennsylvania Bar Association, the Cumberland County Bar Association,
and is
active in the Carlisle Rotary Club. He is a past president of both the Cumberland County Bar Association and the Carlisle Rotary Club. He currently attends the West Shore Evangelical Free Church.
 STEPHEN L. BLOOM, ESQUIRE
Mr.
Bloom is currently the elected Pennsylvania State Representative for the 199th Legislative District. He merged his practice with the firm in 2007. He is a graduate
of The Pennsylvania State University (1983) and The Dickinson School
of Law (1987), where he was inducted into the Woolsack Honor
Society. He is an author (The
Believer's Guide to Legal Issues,
Living Ink Books, 2008) & (They’ve Crossed the Line: A Patriot’s Guide to Religious Freedom, God & Country Press, 2013) and frequent speaker on Christianity and the
law. He has served as an adjunct faculty member in the Department of
Management and Business at Messiah College. He is the former host
of the “Practical Counsel – Christian Perspective” radio program and
the founder of the Estate Planning Council of Cumberland County. Mr.
Bloom has been actively involved in the leadership of numerous
community and ministry organizations, including his church, the Carlisle Alliance Church. He is admitted to practice before the Supreme
Court of Pennsylvania, the United States District Court for the
Middle District of Pennsylvania, and the United States Tax Court.
His legal practice concentrates on estate planning; estate
administration; nonprofit, ministry and small business
organizations; and real estate transactions. He is a member of the
Cumberland County and Pennsylvania Bar Associations and the
Christian Legal Society.
For speaking inquiries please visit
Mr.
Bloom's personal
website.
 MATTHEW
A. McKNIGHT, ESQUIRE
Born and raised in Cumberland County,
Matthew is a graduate of Carlisle High School and received a B.A. in
political science from Grove City College in 2001. He obtained his
Juris Doctor degree from Pepperdine University School of Law in 2004
and joined the firm that same year. Matthew is a member of the
Pennsylvania Bar Association, Cumberland County Bar Association as
well as past president of the Cumberland County 4-H Advisory
Council. He also attends West Shore Evangelical Free Church in
Mechanicsburg. His areas of practice include estate planning, elder
law, business law, real estate, and municipal law.
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