Sue Alexander, a writer who spun tales for children in popular books such as “Nadia the Willful” and championed the efforts of other authors, has died. She was 74.

A founding member of the Los Angeles-based Society of Children’s Book Writers and Illustrators, Alexander died July 3 at her home in West Hills, a suburb of L.A., her husband, Joel, said.

Over a 35-year professional career, Alexander wrote about 25 books for children and scores of stories aimed at young readers for magazines and newspapers.

“First and foremost, she was trying to entertain kids,” Stephen Mooser, a fellow author and the president of the Society of Children’s Book Writers and Illustrators, said recently. “She believed strongly in literacy and the idea that if you could attract a kid’s attention, they’re going to go on to pick up another book and another, and then become readers.”

After years of unsuccessfully submitting stories to children’s magazines, Alexander sold her first book in 1973. Published by Scholastic Books, “Small Plays for You and a Friend” sprang from simple dramas she created for her own children to act.

Other titles followed, including the well-received “World Famous Muriel” (1984) and “Behold the Trees” (2001). Many of the story lines in Alexander’s books — which she wrote but did not illustrate — were drawn from her own experiences.

“Nadia the Willful,” a 1983 book about a Bedouin girl mourning her brother’s death, grew out of Alexander’s grief about the death of her brother and her father’s unwillingness to talk about it.

“Lila on the Landing” from 1987 recalled her 1940s childhood in Chicago, as did “Sara’s City.” That 1995 story poetically captures a night when the city was like “a dark coat with shiny buttons” and a ride on the El reveals back porches showing “little pieces of everybody’s world.”

Born Sue Lynn Ratner on Aug. 20, 1933, in Tucson, Ariz., she spent most of her youth in Chicago. She attended Drake University and Northwestern University but did not graduate. After a brief early marriage failed, she moved to California and married Joel Alexander in 1959. They raised three children.

In 1968, Alexander joined the Society of Children’s Book Writers and Illustrators, an international organization formed to support active and would-be authors and artists. It now has 22,000 members around the world. A longtime board member, she helped create and administer the society’s Golden Kite Award given annually to recognize excellence in children’s literature. The society’s Sue Alexander Award, established in 1996, goes to writers who have produced promising manuscripts, several of which have been published.

Valued as a mentor to writers, librarians and teachers, Alexander received the Dorothy C. McKenzie Award from the Children’s Literature Council of Southern California in 1980 for distinguished contribution to the field of children’s literature.

Besides her husband, Alexander is survived by her sons, Glenn and Marc; a daughter, Stacey Finn; and two grandchildren.