Mr. Tiews specializes in the law of trusts, estate planning and estate and gift taxation, probate, will and trust contests, guardianships, ecclesiastical law, foundations and nonprofit organizations, Medicaid and elder law, noncommercial real estate transactions, and civil litigation defense and appeals. He has taught courses in legal philosophy at Aquinas College and Calvin College in Grand Rapids and has participated as a co-lecturer in National Business Institute, Inc. seminars dealing with Michigan probate law.

Mr. Tiews serves as attorney for the Presbytery of Lake Michigan of the Presbyterian Church (USA), and has served on the boards of a number of non-profit organizations.