Apffel has served on the board of directors of the State Bar of Texas, as a member of the Executive Committee, and chaired the Legislative Policy Committee. He is a former member of the Commission for Lawyer Discipline. He is a member of the College of the State Bar of Texas, a Texas Bar Foundation Life Fellow, and served on the Texas Bar Foundation Board of Trustees.
Apffel is a member of the Galveston County Bar Association and served as the organization’s president in 1996–1997. He is an associate of the American Board of Trial Advocates and a director of the Texas Trial Lawyers Association.
Apffel received a B.B.A. from Baylor University and a J.D. from Baylor Law School. He is certified in Personal Injury Trial Law and Civil Trial Law by the Texas Board of Legal Specialization.