Henry Bildbriain was a London-based millionaire entrepreneur and the owner of Bildbriain Dairies. In 2019, he was "in his sixties". He was stocky, pale-skinned, and had receding, graying red hair.
Bildbriain was killed by the alien entity known as the Greth shortly after it made its way to England. The Greth took over his body, also absorbing his memories in the process, and impersonated Bildbriain to continue having the use of his cheese factor. After the Preternatural Research Bureau began investigating "Bildbriain", he briefly met with them under the persona of Henry Bildbriain, but then dropped the disguise after he decided to kill them, letting Bildbriain's skin fall away and revealing its true fungoid form. The Greth continued to have access to Bildbriain's memories, however, including his familiarity with the myth of Prometheus. (PROSE: Out of the Box)