Getting to work with focused expertise and always delivering solutions. MR. BAS A.S. VAN LEEUWEN (LL.M., ESQ) offers expertise in several different areas of law. The attorney maintains his expertise by continually investing in knowledge management. For matters where do not have the specialist knowledge in-house, he entrusts these to specialist firms with whom he has been collaborating effectively for years. This is how he ensures that you still get the help you need by having a specialist on the case.