Lach is the Director at Complex Co. He has been involved with business startups, joint venture partnerships and company acquisitions. A Chartered member of Engineers Australia, he mentors engineers to reach their full potential. Well-connected, he serves on the board of The Civil Contractors Federation of the ACT and is a member of the Australian Institute of Company Directors. Lach played a key role in establishing the first Engineering secondment program in the ACT. His experience spans large-scale construction and detailed maintenance and remediation projects.