Atty. Duano started his professional experience in litigation as an Associate Counsel in the law firm of Atty. Rufus B. Rodriguez (former Commissioner of the Bureau of Immigration & Deportation and now a member of the 14th Congress of the Republic of the Philippines). Aside from his practice, he teaches law at San Sebastian College, Institute of Law since 1995 to present. He taught the Civil Law subjects of Obligations & Contracts, Sales & Other Special Contracts, Credit Transactions, Partnership, Agency and Trusts and other law subjects like Legal Ethics, Statutory Construction and Legal Counseling. Further, he was special lecturer in the prestigious schools in Manila such as the Co