Born in Pittsburgh in 1951, Shooter started reading comics at age eight, but fell off quickly, feeling the stories were uninteresting. Whilst recovering from surgery at the age of twelve, he started reading Marvel Comics and became a huge fan. He realised that DC Comics were looking boring in comparison, and resolved to "help." Shooter started writing stories for DC characters and teams and sent them in sight unseen. To his surprise, DC replied positively and hired him as a freelance writer at the mind-boggling age of fourteen. Shooter created a variety of minor characters (including the Superman villain Parasite) and set up the idea of Superman and the Flash having occasional races to see who was faster. Shooter briefly worked for Marvel in 1969 but found the renumeration did not cover the cost of living in New York and returned to Pittsburgh. A brief second stint at DC led to an editorial job at Marvel in 1975, this time on a more reasonable salary.
High turnover in Marvel's top ranks saw Shooter rise rapidly through the ranks, becoming Marvel's new editor-in-chief in 1978. He oversaw such projects as Chris Claremont's run on X-Men (though that was already underway), Frank Miller's take on Daredevil and John Byrne's work on Fantastic Four.
Shooter developed a mixed reputation. On the one hand, he stringently imposed deadlines and made writers and artists work to them, sometimes ruthlessly pruning those unable to do so. Marvel's reputation for missing deadlines and sometimes skipping entire months had become quite acute in the mid-1970s, but this ended under Shooter's reign and predictability returned. Shooter initially won over artists and readers by insisting that artists be treated with more respect, paying for them to travel in better conditions to conventions, and giving them a wide leash of creativity. However, after a few years Shooter developed a more restrictive attitude, insisting that comics be written and draw according to his design. Some of the biggest-selling books were left alone, but middling ones saw greater editorial oversight or intervention.
Many writers and artists at Marvel claimed that Shooter's downfall was caused by the runaway success of his Secret Wars storyline in 1985, which he ascribed to his own writing and planning rather than the massive commercial appeal of seeing almost every Marvel character combined into one mega-saga. Shooter became less tolerant of other writers' ideas after this point. With grumbling about Shooter's policies reaching fever pitch, despite his commercial success (Marvel's market share grew to an estimated 80% under his watch)w, he was fired in 1987. He subsequently founded Valiant Comics in 1989, Defiant Comics in 1993 and Broadway Comics in 1995. He returned to work for DC in 2007, and then Dark Horse Comics in 2009.
Shooter also played a key role in the development of Transformers. Hasbro struck a deal with Takara Toys in mid-1983 to bring their Diaclone and Microchange lines of transforming robots to the international market, but found that the Japanese toy lines had little or no expository fiction about what these robots were or what they doing. Some of the toys appeared to be mecha (complete with little pilots), but others did not. Hasbro themselves came up with the names "Transformers" (after some minor controversy worrying about if kids would confuse the name with real-life electrical transformers and somehow fry themselves), "Autobots" and "Decepticons," but realised they didn't have time or storytelling expertise to develop more ideas. They contacted Marvel, noting their successful toy-comic-cartoon collaboration on GI Joe several years earlier.
Shooter looked for a Marvel writer to work on the project, but an early collaboration with Denny O'Neill resulted in little more than the name of the Autobot leader, "Optimus Prime." Shooter himself then briefly took over, developing a design document that contains the first mention of the name "Cybertron" (Shooter himself is often credited with creating the name). Shooter also developed the basic idea of the Autobots and Decepticons fighting a war over resources, particularly energy, and coming to Earth to find more energy, only to crash into Mount St. Hillary (originally Mount St. Helens, until he realised the real-life recent eruption might make that in poor taste) and lie dormant for four million years. Shooter's treatment also features the first appearances of the name "the Ark" for the Autobot ship, and "Aunty" for its computer (Aunty was originally the name of the ship itself but moved to the computer when Shooter decided it was too whimsical). Shooter himself didn't claim to have created all of these ideas, noting some came from conversations he'd been having with O'Neill, and maybe some early conversations with Bob Budiansky. Budiansky then took over the day-to-day work on the franchise, coming with the names of almost all the other Transformers from Shockwave, Megatron and Mirage, right through the 1989 line of Micromasters and Pretenders. Budiansky also became the main writer on the Transformers Marvel comic, which began publication in May 1984, with Shooter editing.
Shooter was something of a divisive figure, respected for his practical trouble-solving skills, his recognition of talent, and fighting for better recognition of Marvel Comics within the wider industry (noting a screaming match with one of the people involved in the Transformers animated series who was trying to pass off Shooter's original design document as his own, since he thought nobody would care about the comics people) but derided for his top-down and sometimes micro-management approach to editing. Secret Wars was enormously popular - and is serving as the primary inspiration for the upcoming next two Avengers films - and may have firmly cemented the idea of the "big crossover mega-event" which would go on to dominate the comics industry (for good and ill).
