During his military career, Zais served in a wide variety of infantry units in Vietnam, the United States, and Korea. He commanded two rifle companies, an infantry battalion, a light infantry brigade, and served as deputy commanding general at Fort Riley, Kansas. Zais was also the Pentagon's Chief of War Plans. As an assistant professor at West Point for three years, he taught organizational behavior, leadership, and management consulting. Zais served as a White House aide and in Panama as executive assistant to the four-star commander of all U.S. forces in Central and South America. In Kuwait, he was commanding general of U.S. and Allied forces. He also served as commanding general of Operation Provide Refuge, the task force that cared for 4,000 Kosovo refugees who entered the United States. Zais' last military assignment was as Chief of Staff of the U.S. Army Reserve Command, the headquarters that administers the 184,000 part-time Reservists, 9,000 civilian employees, and 11,000 full-time military members of the Army Reserve. At the time of his retirement from the military Zais held the rank of Brigadier General. Zais' military awards and decorations include the Distinguished Service Medal; the Defense Superior Service Medal; the Legion of Merit; the Bronze Star; the Meritorious Service Medal; the Air Medal; the Republic of Vietnam Campaign Medal; the Humanitarian Service Medal; the Ranger, Airborne, and Combat Infantryman's Badges; and the South Carolina Meritorious Service Medal.
Newberry College
Zais became the president of Newberry College in August 2000. During his time at Newberry, both enrollment and endowment nearly doubled. The college added forensic chemistry and nursing to the academic curriculum. During the last three years of his tenure, Newberry College was named by U.S. News & World Report as one of America's best colleges. He retired in June 2010, just prior to running for state Superintendent of Education.
South Carolina Superintendent of Education
2010 election
Zais ran in a crowded field for the Republican nomination. Zais was the top vote getter in the primary but did not clear the necessary 50% threshold. Zais defeated Elizabeth Moffly in the run-off. He faced DemocratFrank Holleman, Libertarian Tim Moultrie and two minor party candidates in the November general election. Zais won with 51% of the vote.
Tenure and retirement
Zais opposed implementation of the Common Core State Standards Initiative in South Carolina and withdrew from the state's participation in the federal Race to the Top grant competition. Zais supported the state's Governor to have the power to appoint the State Superintendent of Education, a position shared by a former Democratic Superintendent as well as his successor in the position. By the end of Zais' tenure, South Carolina's on-time high school graduation rates hit an all-time high of over 80% of students finishing within four-years. Zais decided not to run for re-election and endorsed Sally Atwater, widow of Lee Atwater, as his replacement. In the 2014 election, Republican educator and former legislator, Molly Mitchell Spearman, won by a wide margin and currently serves as South Carolina's next State Superintendent of Education.
On October 5, 2017, President Donald Trump announced his intention to nominate Zais to serve as the U.S. Deputy Secretary of Education. He was confirmed by the U.S. Senate by a vote of 50–48 on May 16, 2018.
