[5][6] His brother Jules William Fiske Harrison was, according to The Times, a "skilled and fearless skier" who died in a skiing accident in Zermatt, Switzerland in 1988.

[8] He also trained at the Method acting school, the Stella Adler Conservatory in New York City, when Marlon Brando was its chairman.

[13] She is a descendant of Baron Leonhard Pichler von Weitenegg of the old Swabian nobility[14] Lord of Hornstein[15] and Seibersdorf[16] and Councillor of the Court Chamber to Holy Roman Emperor Ferdinand I.

[26] He has been interviewed and provided commentary on broadcast media outlets including the BBC,[27] CNN,[28] Al-Jazeera,[29] Discovery Channel,[30] US National Public Radio.

He lived, trained and fought alongside matadors including Juan José Padilla, Cayetano Rivera Ordóñez – whose father Paquirri was killed in the ring, and grandfather Antonio Ordóñez the subject of Hemingway's The Dangerous Summer – and Eduardo Dávila Miura of the Miura bull family.

[51] In Spring 2014 Fiske-Harrison co-authored and edited the book The Bulls Of Pamplona, with a foreword from the Mayor of Pamplona and contributions from aficionados of the festival of San Fermín, including John Hemingway, grandson of Ernest Hemingway, Beatrice Welles, daughter of Orson Welles, along with chapters of advice from the most experienced American and Spanish bull-runners.

[54] He returned to acting in 2023 in The Honourable Way Out, a Cold War spy thriller produced by the British Forces Broadcasting Service (BFBS).