Sources: www.ghpbmx.com, BMX Action, ...
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1983 Chris Hoffman , www.ghpbmx.com: GHP - also known as Greg Hill Products was started by Pro BMX racer Greg Hill in August 1983 about a week before the NBL Grands. Greg had just come off and incredible season of TOTAL domination in the Pro ranks (1982) and was kicking some tail in 83' also. GT bikes was his sponsor, but due to some contract (or lack there of) disputes, as well as a need for some new motivation, Greg shocked the BMX world by showing up at the 83' NBL Grands in a GHP uniform and riding a GHP bike! Prior to this event, Gregs Dad had been running a little company called Star Products - most famous for their "Star Bars" and GHP was kind of like taking Star Products to the next level. Having the hottest Pro, a killer team, and good coverage in the mags, GHP thrived for the first year and a half. But the industry as a whole was peaking out, and evolving into different directions.
1984 BMX Axtion june 1984: The prototype GHP freestyle frame. It has a giant top robe, standing platforms on the chain stays, and extra-thick drop outs for the cotta stress that will be imposed on a freestyle bike.
1985 85 GHP Trix frame set.
Yup, Greg actually produced a freestyle frame set! It was designed by Martin Aparijo, one of the top freestylers of the 80's

85 GHP Pro 1.
Production bike produced by GHP. Feature US made frame, fork, bars, and seat post. Suggested retail in 1985 was $279.00. BMX Action tested it in the March 85 issue.

85 GHP Phase 1
Entry level bike produced by GHP. Frame and fork were produced in Taiwan. Suggested retail in 1985 was $219.00 BMX Plus tested it in the spring of 86. Greg actually raced this bike the first half of the 86 season.

Chris Hoffman , www.ghpbmx.com: Going into 1985, everyone's numbers were down, and the days of high-quality, American-made products, were short lived. Cheaper bikes, manufactured overseas were quickly becoming the hot ticket. Alot of the smaller BMX companies were being squeezed out of the picture. With hostile industry trends, along with some personal issues to content with, Greg decided to close up shop. They never "went bankrupt" or "went out of business" in the traditional sense, Greg made a difficult decision to shut down, around June of 1986.
1992 Chris Hoffman , www.ghpbmx.com: Greg went on to ride for Redline, and then Robinson bicycles, winning another number one title, another (4th) NORA cup, and continuing to kick butt in the Pro BMX ranks, until excessive injuries, and a bad case of burnout, led to his retirement sometime around 1992. After a few months off, Greg shocked everyone again by reviving GHP in late 1992! This time things were on a smaller scale, but the updated versions of the frames were AWESOME! Things were kind of sketchy in the Bike industry in the early 90's So I know it wasn't easy to start a new company. However GHP got off to a good start, but then Greg got into some kind of collaborative deal with Pro Forx, and the new GHP only lasted about year.
2006 Chris Hoffman , www.ghpbmx.com: The BMX industry is a very volatile industry that is still evolving and growing, and the last few years in particular have shown us ANYTHING is possible. They say "third times a charm" and if this is true, maybe GHP might emerge again, better than ever!