The Joe Biden and Yoon Suk-yeol administrations have embraced the expansion of economic cooperation within the US-ROK alliance, leading to the emergence of South Korea as a valued technology partner of the United States and an era of institutionalization for the bilateral relationship. This issue of Korea Policy examines the commitments of the two governments to cooperate on the development of critical and emerging technologies and is intended to capture major changes in the depth of cooperation reflected in the intensification and expansion of policy dialogues between the two countries in both technology development and the defense industrial base. Major themes highlighted across the papers include challenges to maintaining a technology-centered coalition among like-minded partners, the impact of political transition on the sustainability of technology-driven cooperation, the role of the private sector, and the implications of expanding the concept of an alliance beyond its core security-centered logic. As the alliance management baton passes from the Biden to the Donald Trump administration, an important question will be whether the Biden administration’s efforts to “lock in” institutionalized cooperation are sustainable through the political transition and whether such efforts will only be successful with “buy-in” from President Trump and his new administration.