Thomas is a specialist property and land development lawyer. His work traverses unit titles, expert opinions, technical easement and covenant advice, resource consent and plan change matters, the Public Works Act, infrastructure agreements, and local government issues. Thomas has presented seminars at academic and industry-based conferences in New Zealand and overseas, and wrote a series of articles on the 10th edition of the ADLS/REINZ Agreement for Sale and Purchase of Real Estate for LawTalk. He is the author of Unit Titles Law & Practice, A Practical Guide to the Land Transfer Act as well as various journal articles. He has provided expert evidence in the High Court on land development matters, and also serves on a number of boards and committees.