Bill is a principal legal advisor to the Australian Catholic Bishops' Conference, various Catholic Archdioceses and Dioceses and many religious congregations. He advises many other charities and not-for-profit organisations. He is also a director (and immediate past Chairman) of the Board of Directors of Catholic Church Insurances Ltd and serves on a number of boards of public companies, private companies and charities.

Bill's principal areas of legal practice are property law, commercial law and the law relating to charities and community groups.

Bill's property law practice centres on all aspects of property transactions including large-scale property development which involves his expertise in environmental and local government law. Bill also acts for many retirement villages and aged accommodation facilities and provides general advice to charities and not-for-profit organisations.

Bill has expertise in all aspects of commercial law with particular emphasis on corporate structuring and directors' duties.

He has decades of experience advising charities and community organisations in many aspects of their activities including structuring, tax exemptions and endorsements. He is a co-author of the Church Administration Handbook. He also sits on a number of charity and community boards which allows him to bring practical experience to his advice.