Mary Kay Henry (born 1958) is an American labor union activist who was International President of the Service Employees International Union (SEIU) from May 8, 2010McDonnell, P. "SEIU Picks First Female President", Los Angeles Times. May 9, 2010. until her retirement on May 20, 2024. She was the first woman to lead the union."Powerful SEIU Selects First Woman As President", Associated Press. May 8, 2010; "SEIU Elects First Woman President", United Press International. May 9, 2010. While serving with the union in California, she helped pioneer SEIU's use of card check agreements, non-traditional collective bargaining agreements, comprehensive campaigns, and system-wide health care organizing strategies.Greenhouse, S. "New Union Leader Wants Group to Be More of a Political Powerhouse", New York Times. May 9, 2010. Henry was included on Times 100 Most Influential People of 2020.

Early life and education Henry was born in 1958 in a suburb of Detroit, Michigan.Evans, M. "United She Stands", Modern Healthcare. November 27, 2006.Vesely, "Doing Their Part for Reform", Modern Healthcare. April 20, 2009. Her father was a salesman and her mother was a teacher, and both were devout Catholics.

Henry credits her faith with giving her an interest in social justice issues. The oldest girl in a family of 10 children, she attended Marian High School in Bloomfield Hills, Michigan. She gained a favorable impression of labor unions from hearing and reading about the work of the United Auto Workers (UAW) in the heavily unionized automotive industry. She worked in a local hospital while in high school to earn money.

In college, Henry initially wanted to become an urban planner. She continued to work in hospitals as an undergraduate student, and also as a medical assistant for the American Red Cross. She earned her bachelor's degree from Michigan State University in 1979, majoring in urban planning and labor relations. While in college, she was a volunteer lobbyist for a grassroots group, and worked alongside union lobbyists on various issues.

Union career Her first job out of college was with the American Foreign Service distributing food stamps to the needy.Pondel, E. "SEIU Getting Healthier", Daily News of Los Angeles. September 1, 2003. When a member from the United Auto Workers suggested that the way to end hunger was to enable people to obtain well-paying jobs, Henry began considering union organizing. Henry joined SEIU as a researcher in 1980. Her experiences as a health care worker prompted her to work for a union that was involved in health care organizing. She joined SEIU because it was one of the few unions hiring women as organizers at the time. During the 1980s, Henry held 18 jobs within the SEIU in California. She served as the San Francisco-area strike coordinator during a 1986 strike by more than 9,000 clerks, certified nursing assistants, and technicians against 14 Kaiser Permanente hospitals and health care facilities throughout California.Leavitt, "Kaiser Permanente Strike Spreads to California", United Press International. October 27, 1986. She helped pioneer SEIU's use of card check agreements , non-traditional collective bargaining agreements, and system-wide health care organizing strategy. In 1993, she was named director of the 475,000-member health care division of SEIU.Rosenblatt, "Battle Over Health Care Reform Shifts to State," Los Angeles Times, September 9, 1994; Shuit, "Defeat May Prove Fatal for Large-Scale Health Reforms", Los Angeles Times. November 10, 1994; Hoerr, J. "A Strong Labor Partner", Pittsburgh Post-Gazette. November 5, 1995.

Henry was elected to SEIU's executive board in December 1995 after President John Sweeney resigned after his election as President of the AFL-CIO."John Sweeney Steps Down From Top SEIU Post", Service Employees International Union, December 12, 1995. SEIU President Andrew Stern named Henry his assistant for organizing in 1996. Henry was named assistant to then-SEIU Executive Vice President Eliseo Medina in 1998. She remained active in the union's health care organizing, however, representing SEIU in its talks in 1999 to secure a card check agreement with the Catholic Healthcare West hospital chain."Talks Falter in Effort to Form Union for Catholic Healthcare West Hospital Workers", Associated Press. August 6, 1999. More than 17,000 new members at 27 hospitals were organized under that agreement. She was also involved in SEIU's successful negotiations with Tenet Healthcare for a card check agreement.White, "Unions Battle for Nurses", Los Angeles Times, August 3, 2003.

She was named SEIU's Southern California organizing director in 2000, the international union's chief healthcare strategist in 2004, and elected an Executive Vice President of the union in 2004."Mary Kay Henry", Modern Healthcare. April 20, 2009.Evans, M. "Laboring for Union Nurses", Modern Healthcare. May 23, 2005. Henry helped oversee what she said in 2005 was a $150 million organizing budget, which SEIU intended to use to organize more than 1 million additional nurses over the next decade.Evans, "Split in AFL-CIO May Pose Hardships for Bosses", Modern Healthcare. August 1, 2005.Despite her rise in the union, Henry still oversaw SEIU's health care organizing efforts (see Evans, M. "United She Stands", Modern Healthcare, November 27, 2006). She helped negotiate a "no-raid agreement" between SEIU and the United American Nurses in 2006. In her first 25 years with SEIU, Henry played a major role in organizing drives at Beverly Enterprises, Catholic Health Care West, Tenet Healthcare, and HCA, Inc. Stern relied on her to coordinate and lead important legislative efforts. SEIU Executive Vice President Dennis Rivera took over Henry's healthcare organizing duties in early 2007.Evans, M. "SEIU's Power Player", Modern Healthcare. February 5, 2007.

Henry and Medina helped plan the breakup of SEIU United Healthcare Workers West (UHW-West), a 140,000-member SEIU local, and force half its membership into a new statewide local which SEIU claimed would have enhanced collective bargaining and lobbying power.Robertson, K. "SEIU Plans to Form New Union of Health-Care Workers", San Francisco Business Times. January 9, 2009; Larrubia, E. "SEIU to Create a Giant Branch", Los Angeles Times. January 11, 2009. UHW-West leaders balked at the plan, SEIU established a trusteeship over UHW-West, UHW-West leaders challenged the trusteeship and established an independent union (the National Union of Healthcare Workers, or NUHW), and the two unions began fighting over who would represent more than 100,000 employees in 350 bargaining units.Brenner, M. "SEIU Launches Takeover of United Healthcare Workers-West", Labor Notes. January 28, 2009; Brenner, M. "Finally, NUHW Squares Off Against SEIU in Two Hospital Elections", Labor Notes. December 16, 2009; Brenner, M. "NUHW Takes Kaiser Elections", Labor Notes. January 26, 2010; Early, "How a New Union Is Staying Afloat (with a Little Help from Its Friends)", Labor Notes. August 17, 2009; "Ex-SEIU Leaders in Calif. Plan to Start New Union", Associated Press. January 29, 2009.Larrubia, E. "Ousted UHW Leaders Form New Labor Group", Los Angeles Times. January 29, 2009.Rhea, S. "A Field of One", Modern Healthcare. May 3, 2010. Henry expressed strong anger at the move to create an independent union.

SEIU presidency On April 13, 2010, several media sources reported that Stern would resign immediately as president of the union.McDonnell, Pringle, and Nicholas, "SEIU President Andy Stern Reportedly Will Step Down Soon", Los Angeles Times. April 14, 2010.Greenhouse, S. "Andy Stern to Step Down as Chief of Politically Active Union", New York Times. April 13, 2010.MacGillis, A. "At Peak of Influence, SEIU Chief Set to Leave", Washington Post. April 14, 2010. Stern resigned on Thursday, April 15. Anna Burger, SEIU's Secretary-Treasurer and the Chair of the Change to Win Federation, was named SEIU's interim president, to serve for 30 days until the SEIU Executive Board could name a permanent successor. Burger was widely considered to be Stern's likely successor.Carlson, J. "A Stern Farewell", Modern Healthcare. April 19, 2010. Henry was considered a dark horse candidate, although likely to challenge Burger for the presidency. Several SEIU insiders urged Dennis Rivera to seek the presidency as well.Gonzalez, J. "Labor Union Surprise Exit", New York Daily News. April 14, 2010. Stern, however, publicly endorsed Burger for the position.McDonnell, P. "SEIU Rift Opens Over President's Successor", Los Angeles Times. April 27, 2010.McDonnell, P. "Path Cleared for New SEIU Chief", Los Angeles Times. April 29, 2010.

Support for Henry's candidacy swiftly grew. Within days of Stern's resignation announcement, four Executive Vice Presidents with the international union sent an e-mail announcing their support for her.Hananel, S. "Powerful Union Closer to Picking New Leader", Associated Press. April 29, 2010. "Mary Kay's greatest strength is her ability to build consensus and create a highly effective team around shared goals and responsibilities. Mary Kay is the type of leader who motivates rather than demands", the note said. The e-mail also cited the need "to return to organizing as our top priority" and "to restore our relationships with the rest of the union movement and our progressive allies."Scanlon, "Meet Big Union's New Boss", Washington Times. May 11, 2010. Twelve days after Stern's announcement, national media reported more local unions representing more than 60 percent of SEIU's 1.9 million members had agreed to support Henry's candidacy.Greenhouse, S. "Grass-Roots Choice Leads Race for Top Union Post", New York Times. April 27, 2010. Among the reasons why local union leaders backed Henry were the desire to have a fresh person in the leadership role, Henry was seen as a consensus builder, Burger was seen as too close to the authoritarian Stern, and Henry was viewed as more focused on organizing new members (while Burger was seen as focused on SEIU's political activity).

National press reported that some local and regional SEIU leaders felt Henry would be less likely to continue Stern's local union merger program and more conciliatory to breakaway unions such as those in California. But Burger's backers countered that Henry had never led a local union, had little on-the-ground organizing experience, and had associated with many SEIU staff and elected leaders tainted by recent scandals over financial impropriety. Despite these charges, several large union locals in California and New York backed Henry. Support for Henry also seemed to gain momentum when she told members of the international union's executive board that she favored letting local unions, not leaders based in Washington, D.C., set the union's agenda.Weber, J. "Union Leadership Election May Signal Shift in Strategy", Washington Times. April 30, 2010. In a memo sent to SEIU leaders nationwide, Henry said, "Our local unions and divisions should drive our national priorities, not the other way around." On April 28, Burger withdrew as a candidate for the presidency. Burger said she would not resign as the union's Secretary-Treasurer, and endorsed Henry."Digest", Washington Post. April 29, 2010.