Kongsik provides start-up, emerging-growth, and large companies with strategic advice on building and managing defensive and offensive patent portfolios, renders patent infringement and validity opinions, conducts due diligence investigations, drafts and negotiates transactional agreements, and litigates to enforce and defend intellectual property rights.

His practice covers a wide range of technologies such as chemistry, biochemistry, pharmaceuticals, biosimilars, chemical engineering, biochemical engineering, agricultural and food biotechnology, biomedical engineering, enzyme technology, environmental engineering, polymer engineering, semiconductor technology, LCD, LED, and OLED technology, fuel cell technology, solar energy and clean technology, automobiles, medical devices, testing and measuring instruments, wireless communication, computer software, touch-screen display panels, and 3D display panels.

Prior to joining the firm, he was a partner in the Boston office of another international law firm. Before practicing in the US, he worked at Kim & Chang, the largest law firm in Korea, as a registered Korean patent attorney. He authored books on Korean patent law and design protection law.