Professor Sieg Eiselen BJuris LLB LLD (Potchefstroom University) is a Professor in the Department of Private Law at the University of South Africa, where he lectures in general contract law, unjustified enrichment law, international trade law and information technology law. He is a member of the Johannesburg Bar and co-author with Professor Albert Kritzer (of Pace Law School, New York) of the International Contract Manual Volumes TV and V (Thomson West). Secretary of the CISG Advisory Council, he has published on general South African contract law, unjustified enrichment law, international trade law and harmonisation, information technology law and private international law.