Meretzky was raised in Yonkers, New York. His father was trained as an accountant, but spent a career of 25 years selling automotive hardware. Meretzky's mother was a bookkeeper. He graduated from Yonkers High School in 1975. He went on to attend the Massachusetts Institute of Technology, where he earned a Bachelor of Science in construction management in 1979. After working in the construction industry for two years, in 1981 Meretzky decided to pursue a career as a game tester for Infocom. In 1983, he became a full-time writer (an "Implementor"), scripting "Planetfall" and creating the famous cult figure robot sidekick "Floyd".