Kevin K. McAleenan (born September 5, 1971) is an American attorney and public official best known for serving as Acting Secretary of the Department of Homeland Security and as Commissioner of U.S. Customs and Border Protection. His time in senior DHS roles occurred during a period of intense public and political attention to U.S. border and immigration policy.

Career and roles

McAleenan spent much of his public career in roles connected to customs, border security, and trade enforcement. A lawyer by training, he worked both in government and the private sector before joining senior leadership at DHS. In leadership positions he had oversight responsibilities for large operational agencies, including ports of entry, international cargo inspections, and immigration enforcement coordination.

  • Commissioner, U.S. Customs and Border Protection (senior leadership beginning in early 2018)
  • Acting Secretary of Homeland Security (April through November 2019)
  • Prior legal and policy roles related to customs and trade enforcement

Tenure as Acting Secretary

McAleenan became Acting Secretary of the Department of Homeland Security following the departure of his predecessor in spring 2019. In that capacity he supervised a broad portfolio that includes border security, immigration enforcement, cybersecurity, disaster response, and transportation security. His tenure coincided with an increase in migration along the U.S. southern border and heightened debates over asylum, detention, and processing capacity.

Resignation and subsequent work

He announced his resignation on October 11, 2019, and stepped down from his acting post later that year. Public statements at the time said he planned to spend more time with family and to pursue opportunities in the private sector. After leaving government, McAleenan moved into roles in consulting and the private domain that leveraged his experience in border and trade matters.

Controversies, policy context and legacy

McAleenan’s period in office was marked by contentious national debates over immigration enforcement practices and border management. Supporters pointed to efforts to strengthen port operations and respond to operational challenges; critics focused on humanitarian concerns, litigation over enforcement actions, and broader policy choices of the administration he served. His short, interim leadership is often viewed through the lens of those larger policy conflicts rather than as a long-term administrative tenure.

Whether assessed for operational reforms or for the political controversies of 2019, McAleenan remains a notable figure in recent U.S. homeland security history, illustrating how legal, operational and political responsibilities intersect at senior levels of federal agencies.