Emma Lathen

At the time of Latsis' death in 1997, the duo were eighty percent through a new book using the setting of the 1991 Persian Gulf War, but Henissart elected not to finish it.

As Lathen, they wrote 24 mystery novels starring John Putnam Thatcher, a Wall Street banker. According to Latsis, “We decided on a banker because there is nothing on God’s earth a banker can’t get into.” They also wrote under the pseudonym R. B. Dominic; the 7 Dominic stories feature Congressman Benton Safford as the sleuth. Each book features events in a specific industry or activity with which Thatcher or Safford become involved in the course of their work. The books often refer to specific public events in their plotting; for example, When in Greece is mostly set in that country during the Colonels' Revolution, and Going for the Gold involves the 1980 Winter Olympics at Lake Placid. Others relate to more general social and other trends, such as Death Shall Overcome which links with the Civil Rights Movement.

Henissart and Latsis met as graduate students at Harvard, where Henissart studied law and Latsis studied economics and public administration. Latsis grew up in Chicago and graduated from Wellesley College. Henissart received her B.A. in physics from Mount Holyoke College in 1950. Latsis worked for the CIA and the United Nations Food and Agricultural Organization and taught economics at her alma mater, Wellesley College. Henissart practiced law in New York and then returned to the Boston area to become the chief legal counsel for Raytheon. When they began writing mysteries in the early 1960s they decided to use a pseudonym and maintain the secret of their identities to avoid any conflict with employers and clients. Their identities as co-authors of the popular Lathen books remained a secret until 1977.

Emma Lathen is the pen name of two American businesswomen: economic analyst Mary Jane Latsis (July 12, 1927 – October 29, 1997) and attorney Martha Henissart (born 1929). The pseudonym is constructed from two authors' names: "M" of Mary and "Ma" of Martha, plus "Lat" of Latsis and "Hen" of Henissart.