He is the creation of writer and sound artist Thomas Lopez and is played by actor Robert Lorick.
Jack is an adventurer who travels the Earth, exploring both familiar physical places and a metaphysical land called the Invisible Realms.
His character adapts as the story requires, ranging from a bumbling fool to a competent and professional detective into spiritual mysteries.
Well-versed in the occult, folklore, primitive magic and various mystic phenomena, he is able to withstand most reality-altering experiences and generally has an open mind towards all things.
As the nephew of those adventurers from a past age, Lord and Lady Jowls, Jack is somewhat of a man out of time, dressing in a white suit and Panama hat.
On one occasion, at least, while living in London prior to the first adventure (The Fourth Tower of Inverness), he swallowed hashish ("purely by accident") and saw a unicorn as a result.
In Midnight at the Casa Luna, two of the characters refer to Jack's relationship with an Ifrit, Layla Oolupi, which ended badly.
Jack says that he first encountered Layla at Woodhenge,[2] an event alluded to in Moon Over Morocco as occurring in a dream/vision of their past shared life.
Lady Jowls suggests in The Fourth Tower of Inverness that many of the characters in the series have known each other in past incarnations and are destined to move through time together.
He lives principally in an apartment in New York and later inherits the mansion and estate of Inverness, so a good deal of family money can be assumed.
The settings for these stories are spread out across the globe but they are all tropical - the Amazon, Rio, India, Bali, Sumatra, Belize, Costa Rica.
With the core group growing, the stories become more of an ensemble effort with Jack taking a less assertive and more bumbling role, often being the butt of jokes, especially from Dominique who frequently launches into political diatribe.