He became president of the Psychic Society of Ireland and carried out a series of tests and experiments into psychic abilities - including a game of chess-by-telepathy with a student in Australia - which attracted local media attention. Still in his teens, he began to give public talks and demonstrations of extrasensory perception, and he wrote his first book: How to Develop Your ESP (Harper-Collins), which is still being reprinted today, and which has been translated into a number of languages. He also produced his first Calendar of Predictions, which he continued to publish annually until 2000. Around this time he also began to make regular visits to Copenhagen, Denmark, where he lived and worked in the experimental community of Christiania.

He was asked to help in a number of police investigations in the UK and Ireland, most notably the Brittas Bay Murder, the disappearance of schoolboy Philip Cairns and the kidnapping of the race horse Shergar. Since then he has received a steady stream of requests from police forces around the world - including Scotland Yard - for help with unsolved cases.

He practiced as a psychotherapist in Dublin for several years, then went to live in London, where he established the London Psychic Centre at the exclusive Sherlock Holmes Hotel in London's Baker Street. The Centre became a major Mind-Body-Spirit venue, attracting thousand of visitors weekly to attend lectures, workshops and demonstrations, and to consult the resident team of psychic advisors. The London Psychic Centre was the subject of numerous TV programmes, including Nationwide, The 6 O'Clock Show, Breakfast TV and many others, and was a mecca for Britain's pop stars and showbusiness personalities.

Zak Martin established his own private consultancy at Kensington, London. His clients include royalty, politicians, heads of major companies, pop stars, TV and movie personalities, and, of course, police departments from around the world seeking his help with unsolved crimes.

Apart from his work as a psychic, Zak Martin has many interests, including playing music, song-writing, painting, martial arts (he is a 2nd dan black belt in Shotokan karate and has taken part in public exhibitions of martial arts), writing and chess. He is also actively involved with the Anti War Movement, and writes articles on this subject.

Zak Martin has a 13 year-old-daughter, Galéna, by former top Irish fashion model, Rachel Murray.
Galéna, like her father, is a proficient musician and plays several instruments. She has performed at the Irish National Concert Hall with the Irish Academy of Music orchestra, playing cello - and in pop concerts, playing bass guitar. Her debut public performance was introduced by U2's Edge.

Zak Martin lives in Granada, in the South of Spain, and is currently working on several projects, including writing a new book. He is also managing director of Isis Communications (UK) which recently acquired UK Psychics, Britain's premier psychic and Mind-Body-Spirit portal.

Zak Martin also heads several companies not connected with the psychic field, including the UK-based multimedia company, Isis Communications, and, in Spain, the Granada-based real-estate company, Granada Properties, the property search engine FindSpanishProperty.com, and the portal website CostaTropical.com. He rarely gives interviews and will only consider taking part in television programmes on psychic and psychological topics which, in his opinion, are intelligent, original and thought-provoking in concept and format.