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After leaving IBM in 1996 I founded a small Microsoft Office consultancy and software development company, Decision Models. I specialise in providing Excel and VBA based departmental solutions, often with relational database backends. My special interest areas are: - Excel Calculation performance - VBA UDFs & VBA Performance - C++ XLLs - Excel JS API - Large Excel models - Excel Defined Names - Excel as frontend to Relational Databases I am co-author with Jan Karel Pieterse of Name Manager, a widely-used utility for managing Excel defined names, and author of FastExcel, a commercial product to help optimise Excel calculation speed.