In his book The Highgate Vampire, Seán Manchester states that the vampiric source of the Highgate infestation first showed up shortly after the infamous vampire plague of the early 1700's, the same era as Arnold Paole and Peter Plogojowitz. He further states that an Eastern European nobleman occupied Ashurst House in the early 18th century. This all seems to make sense, and it suggests that Tamás Orszag of Hungary is the most likely candidate for the identity of the Highgate Vampire.
A composite of the Highgate Vampire's appearance can be gleaned from various statements in the Vampire Research Society's archive and, of course, on public record in Seán Manchester's The Highgate Vampire.*
Accounts provided by witnesses in the Hampstead & Highgate Express, 13 February 1970 & 20 February 1970, describe "a most unusual form [that] just seemed to glide across the path ... a pale figure ..."; "Many tales are told about a tall man who walks across Swains Lane and just disappears through a wall into the cemetery ..."; " ... a 'form' moving behind some gravestones ... the thing made no sound and seemed to disappear into nowhere ..." *
Jacqueline Beckwith, a teenager living in North Hill, awoke one night with something icy cold clutching her hand which soon went numb. The next morning revealed "deep tears in the flesh where she had forced [her hand] free." *
A ghost hunter by the name of Thomas told of "a dark shape [which] moved across the path directly in front of us." On an earlier occasion he had started to walk home with his fiancee down the lane running alongside and eventually between Highgate Cemetery. "Something was standing behind the iron railings of the gate ... upon its face was an expression of basilisk horror." *
Once again, "the thing behind the gate appeared to dissolve into the shadows of the night."
* (The Highgate Vampire, pages 49, 54, 65, 66, 67, 68, 85, 86 & 142, Gothic Press edition)