From 1980 to 1982, she was a Senior Engineer at M/A-COM Gallium Arsenide Products, Inc., where she worked on epitaxial growth of GaAs for microwave components and development of mm-wave devices. In the fall of 1982, she joined the faculty of the Electrical and Computer Engineering Department at the University of Massachusetts/Amherst, where she became a full professor in 1993. She initiated metalorganic chemical vapor deposition (MOCVD), compound semiconductor materials and devices programs at UMass. Her research group performed studies on heterostructures, quantum wells, strained-layers, III-V selective epitaxy, as well as high-frequency and photonic devices. Professor Lau spent her first sabbatical leave in 1989 at the MIT Lincoln Laboratory and worked with the Electro-optical Devices Group. She developed acoustic sensors at the DuPont Central Research and Development Laboratory in Wilmington, Delaware during her second sabbatical leave ('95-'96). In the fall of 1998, she was a visiting professor at the Hong Kong University of Science and Technology (HKUST), where she joined the regular faculty since the summer of 2000. She established the Photonics Technology Center for R&D effort in III-V and wide band-gap semiconductor materials and devices.