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G.I. Joe is considered to be the first action figure to enter the toy market. As the first doll-like toy marketed specifically for boys, the first G.I. Joe action figures were just under 12 inches tall and had moveable joints to allow for posing in different stances.

Games Children Play: How games and sport help children develop was written by Kim Brooking-Payne and published in 1996 by Hawthorn Press. The aim of the book is not only to outline ways of organizing children’s games, but also to give insight into why the game is appropriate for a particular age or stage of development.

Jessie H. Bancroft wrote Games for the Playground, Home, School and Gymnasium in 1909 as a practical guide of 400 games for adult and child players in active games, quiet games, singing games, skilled athletic feats, and ball and bean bag games. He believed that "play, in games and other forms, is nature's own way of developing and training power."

GameTime, a division of PlayCore, began operations in 1929 in Michigan. They use research-based design and engineering in manufacturing the company's products. GameTime's independent research studies are conducted by noted experts in the fields of fitness, nature, education, and urban issues, and are used as the foundation when designing their products.

GenMove is dedicated to providing programs, staff services, and equipment that assists every child to experience athletic achievements, contribute to a team, and choose a healthy lifestyle regardless of physical limitations, athletic abilities, or past experiences.

The Girl Scouts is a leadership development organization for girls with the mission to build girls of courage, confidence, and character, who make the world a better place. Juliette Gordon Low established the Girl Scouts in 1912.

Richard Gottlieb, a known authority on the "business of play," created the blog Global Toy News because he felt there was a need "for serious (and sometimes playful) commentary on the toy industry." His commentary has ranged from exploring controversial issues and trends to discussions of books, games, TV, sports, science, music and interviews of toy industry leaders.

Dr. Roberta Michnick Golinkoff believes "play is the vehicle through which children maximize their development" and that "children learn best through play and when their learning is embedded in a playful context." As a professor, director, researcher, writer, and speaker, Dr. Golinkoff is "a scientific advocate for children."

As a teacher, researcher, and writer, Dr. Elizabeth Goodenough has explored and championed children’s need for their own spaces. Dr. Goodenough collaborated on a 60-minute PBS documentary “Where Do the Children Play?” that aired in 2007.

Rick Henke, a creator of integrated playscapes and accessible play equipment for children of all abilities, founded Goric in 1994. Goric's product line includes outdoor play elements that allow children to experience gravity and centrifugal forces, sensory and sound play elements, sand and water play, cable net structures, site furnishings, and protective rubber surfacing.

As a research professor of psychology at Boston College for 30 years, Dr. Peter Gray brought the evolutionary viewpoint to general psychology, education, human development, and children’s play.

Green Hearts Institute for Nature in Childhood was a nonprofit conservation organization focused on “bringing children and nature back together” as a crucial step in raising a new generation of conservation-minded adults.

Esther Fidler Grossman is a playground designer, consultant, and children's safety advocate for indoor and outdoor inclusive play areas. She is passionate about creating child care center inclusive play environments and outdoor classroom learning environments.

Luther Halsey Gulick gave significant leadership and promotion to the playground and recreation movements of the early 1900s. With most of his time involved in the fields of physical education and hygiene, he liked to take ideas and thoughts, develop them further, put an organization together to bring the ideas to fruition, and then turn the leadership over to others while he moved on to another set of ideas.