Todd J. McCaffrey (born 27 April 1956 as Todd Johnson) is an Irish American author of science fiction best known for continuing the Dragonriders of Pern series in collaboration with his mother Anne McCaffrey.
Todd Johnson was born 27 April 1956 in Montclair, New Jersey as the second son and middle child of Horace Wright Johnson (deceased 2009), who worked for DuPont, and Anne McCaffrey (deceased 2011), who had her second short story published that year. He has two siblings: Alec Anthony, born 1952, and Georgeanne ("Gigi", Georgeanne Kennedy), born 1959.
Except for a six-month DuPont transfer to Düsseldorf, Germany, the family lived most of a decade in Wilmington, Delaware, until a 1965 transfer to New York City when they moved to Sea Cliff, Long Island. All three children were then in school and Anne McCaffrey became a full-time author, primarily writing science fiction. About that time, Todd became the first of the children to read science fiction, the Space Cat series by Ruthven Todd. He attended his first science fiction convention in 1968, Lunacon in New York City.
Soon after the move, Todd was directed to lower his voice as an actor in the fourth-grade school play, with his mother in the auditorium. That was the inspiration for Decision at Doona (1969) which she dedicated "To Todd Johnson—of course!" The story is set on "an overcrowded planet where just talking too loud made you a social outcast".
Anne McCaffrey divorced in 1970 and emigrated to Ireland with her two younger children, soon joined by her mother. During Todd's school years the family moved several times in the vicinity of Dublin and struggled to make ends meet, supported largely by child care payments and meager royalties.
Todd finished secondary education in Ireland and returned to the United States in 1974 for a summer job before matriculation at Lehigh University in Pennsylvania. He studied engineering physics and discovered computers but remained only one year. Back in Dublin he earned a Mechanical Engineering degree at the College of Technology (Bolton Street). Later he earned a Politics degree at Trinity College, Dublin.