Daniel is the Chief of the Implementation Support Unit (ISU) of the Biological Weapons Convention within the United Nations Office for Disarmament Affairs in Geneva. He manages the activities of the ISU and the implementation of other activities in support of the BWC. He has served as the Secretary to all formal BWC meetings since late 2014, including the Eighth and Ninth BWC Review Conferences in 2016 and 2022, respectively.

Daniel has experience both in the field of multilateral disarmament and in working with international organizations. From 2009 to 2014, he worked in the Technical Secretariat of the Organisation for the Prohibition of Chemical Weapons (OPCW) in The Hague. At the OPCW, Daniel oversaw education and outreach activities, was involved in the preparation and conduct of the Third Review Conference of the Chemical Weapons Convention, and worked closely with partners in other international organizations, the scientific community, and civil society.

Prior to joining the OPCW, Daniel spent 12 years as a Research Fellow with the Harvard Sussex Program on Chemical and Biological Weapons at the University of Sussex, where he worked on chemical and biological weapons issues and published widely on these topics.