At O'Hanlon, Demerath & Castillo we are committed to providing superior client service and legal representation for our clients. Based in Austin, with offices in San Antonio and the Rio Grande Valley, our lawyers welcome clients to bring questions and encourage inquiries from around the State and Country about what the firm can do for them. Our expertise and experience, combined with our highly trained staff, make us uniquely well - equipped to handle even the most complex cases. You can count on a Depth and Breadth of Experience in your area of need.