Jack got his start with a used Sinclair ZX81 and 16K RAM pack, purchased via a local newspaper. From there, he was hooked and eventually came to own one of the most complete collections in the US.
Jack built one of the first websites about the Timex/Sinclair computers, TIMEX/SINCLAIR Showcase, in the late 1990s. For a long time, it was the only resource online about the Timex/Sinclair computers.