[3] He has been a prominent advocate for a new treaty to regulate States' behavior on-line and establishing an international legal duty to assist victims of significant cyberattacks.
He earned Superior Honor Awards for his work on the Oil Platforms case as well as for negotiating an agreement on the implementation of the Montreal Protocol for the Protection of the Ozone Layer.
[12] Hollis has also co-authored several articles with political scientist Martha Finnemore exploring the construction of norms in cyberspace[13] and the rising practice of states accusing each other of launching malicious cyber operations.
[17] From 2016 to 2020, Hollis served as an elected member of the OAS’s Inter-American Judicial Committee[18] where he led projects on establishing the IAJC Guidelines on Binding and Non-Binding Agreements[19] and improving the transparency of State views on international law's application to cyberspace.
[23] Supreme Court Justice Stephen Breyer repeatedly relied on Hollis' comparative work in his dissenting opinion in the Medellín v. Texas case.