Title: One Day at a Time (novel)
Content:  One Day at a Time is a novel by Danielle Steel, published by Delacorte Press in February 2009. The book is Steel's seventy-seventh novel.
Title: One Day at a Time (1975 TV series)
Content:  The series was created by Whitney Blake and Allan Manings, a husband-and-wife writing duo who had both been actors in the 1950s and 1960s. The series was based on Whitney Blake's own life as a single mother raising her three children (including future actress Meredith Baxter) after her divorce from her first husband.
Title: One Day at a Time (1975 TV series)
Content:  One Day at a Time is an American television sitcom that aired on CBS from December 16, 1975, to May 28, 1984. It starred Bonnie Franklin as a divorced mother raising two teenage daughters, played by Mackenzie Phillips and Valerie Bertinelli, in Indianapolis.
Title: One Day at a Time (song)
Content:  "One Day at a Time" is a popular Country and Western-style Christian song written by Marijohn Wilkin and Kris Kristofferson. It has been recorded by over 200 artists and has reached No.1 in several territories. Scottish singer Lena Martell had a UK Singles Charts number one with her version in 1979.
Title: One Day at a Time (novel)
Content:  Coco's mother, a successful novelist
Title: One Day at a Time (2017 TV series)
Content:  One Day at a Time is an American sitcom based on the 1975 series of the same title. Executive producer Norman Lear's company, Act III Productions, approached Sony Pictures Television with the idea of reimagining the original series with a Latino family. Lear had previously executive produced the original series. The series was developed by Gloria Calderón Kellett and Mike Royce, with Lear and his producing partner Brent Miller as executive producers. The series features an ensemble cast starring Justina Machado, Todd Grinnell, Isabella Gomez, Marcel Ruiz, Stephen Tobolowsky, and Rita Moreno. The show revolves around a Cuban-American family living in the Los Angeles neighborhood of Echo Park, focusing 
Title: One Day at a Time (novel)
Content:  Daughter of a wealthy dramatic agent Buzz Barrington in Hollywood and a best-selling romance novelist mother Florence Flowers
Title: One Day at a Time (novel)
Content:  Jane's gay partner
Title: One Day at a Time (novel)
Content:  Elder sister of Coco, a successful movie producer
Title: List of One Day at a Time (2017 TV series) episodes
Content:  One Day at a Time is an American sitcom loosely based on the 1975–1984 CBS series of the same name, developed as a Netflix original program and later airing on Pop TV. The series is written by Gloria Calderón Kellett and Mike Royce. Justina Machado, Todd Grinnell, Isabella Gómez, Marcel Ruiz, Stephen Tobolowsky, and Rita Moreno star in the series, with Pam Fryman directing the pilot episode. The first season, consisting of thirteen episodes, was released on January 6, 2017. On March 4, 2017, the series was renewed by Netflix for a second season, which premiered on January 26, 2018. On March 26, 2018, a third season was ordered, which was released on February 8, 2019. On June 27, 2019, Pop TV commissioned a fourth season of the series, after Netflix canceled it in March 2019. The fourth season premiered on March 24, 2020, 

Question: Who is the author of One Day at a Time?
Answer: Danielle Steel.
Danielle Fernandes Dominique Schülein-Steel.
Danielle Fernandes Dominique Schuelein-Steel.