[2] As Chief of Staff, Rosenbach assisted Secretary Ash Carter on the Department of Defense's major challenges of the time, which included increased Russian aggression, the Syrian Civil War, and North Korean missile tests.

From September 2011 to August 2014, he served as the Deputy Assistant Secretary of Defense for Cyber, in which role he oversaw and led the DoD's cybersecurity strategy.

[5] Returning to Harvard Kennedy School to teach in 2007, Rosenbach was the executive director of the Belfer Center for Science and International Affairs for three years before going to the DoD.

Rosenbach got involved in Davidson's Dean Rusk International Studies Program and found public service appealing.

[8]” The Dean Rusk program gave Rosenbach a grant to go to Vietnam - the country where his father had flown for the US Air Force and had almost been shot down.

The unit, which worked closely with the National Security Agency,  provided strategic information to support US operations in Bosnia and Kosovo.

He co-authored Presidential Policy Directive 20, which established principles and processes for US cyber operations and was signed by President Barack Obama in 2012.

[13] In that role he led the DoD's efforts to deter Chinese theft of American intellectual property and to counter Iranian and North Korean cyber attacks against US critical infrastructure.

As Chief of Staff, Rosenbach was a senior leader of the Department of Defense, an organization with a yearly budget of $550 billion, 2.8 million personnel, and high-stakes operations across the globe.

[2] Rosenbach and Carter's many objectives were defeating ISIL, building effective cyber strategy, and opening all combat positions to female service members.

With Robby Mook and Matt Rhoades, Rosenbach founded and ran the Defending Digital Democracy Project, an initiative aiming to identify and build mitigations for cyber vulnerabilities in democratic elections.