Smith wrote several books (see details below) and gave frequent public addresses, usually to audiences at churches both in major cities and small towns all around the world. His themes were principally Christian eschatology, conspiracy theory and a Christian evangelical message encouraging his audiences to accept Christ as their Saviour.

Many bold claims were made by Smith, both in his books and at his public meetings which were controversial. He preached/lectured using many anecdotes, many of which were not easy to independently verify. Frequently it was not clear through how many intermediaries a story had passed before reaching him and his audience.

• Smith describes global warming as a "red herring." Smith claims there is no evidence that the greenhouse effect has begun.
• HIV, the virus responsible for AIDS, was in fact deliberately made by the World Health Organisation and the US Army research institute in Fort Detrick, Maryland, is involved in secret biological warfare programmes against the "free world".

Further, Smith claims that ozone and hydrogen peroxide can be used to kill the AIDS virus when administered to the blood streams of those infected. Barry quoted the name of a doctor in Nairobi allegedly carrying out this procedure. There does not appear to be any independent or peer reviewed corroboration of this anecdotal claim.

• A Russian cruise ship, the Mikhail Lermontov, which struck a rock in the Marlborough Sounds, New Zealand, and sank, in 1986 was the subject of a deliberate cover-up and conspiracy, involving possibly, espionage activities by the then Soviet Union's navy. Conspiracy theories concerning this sinking have persisted in New Zealand.

Smith was a proponent of the 9/11 conspiracy theories, claiming that the September 11 attacks were orchestrated by the US federal government.

He stated that he was not a prophet and admitted that he made mistaken predictions; he claimed that he was just "a commentator". Shortly before his death in 2002 he was forecasting an imminent worldwide financial and economic "collapse". At the end of 2008, that is one forecast whose fulfillment some would see in contemporary events.

His favourite song was "Amazing Grace", with which he ended his meetings and in his eyes his greatest success was not in forecasting future events, but in leading surprisingly large numbers of individuals to accept Christ Jesus as their Lord and Saviour. As with most Christian evangelists, there is no independently verifiable data source to consult in order to determine the lasting success of his evangelism. However, the churches he preached at appreciated his work greatly, and benefitted from it sufficiently to want to invite him back repeatedly during his lifetime.

(The best validation of these comments is by referral to his own videos or books which may be obtained [1]. Some are also broadcast by God Channel TV.)

In an interview published in Challenge Weekly, a New Zealand Christian newspaper, Mr Smith commented on the collapse of the world economy and that the mark of the beast was already being advertised around the world. His belief was that it was a tiny electronic radio frequency chip that was placed under the skin. He said that animals were being chipped and that there were plans to put them on humans. The Ex-Catholics for Christ website reported that amongst The New World Order and Trilateral Commission, micro chipping was one of the subjects he liked to talk about. Interestingly the Christian Witness Ministries website talks about Mondex implants and relates to and reflects on the words of Barry Smith who warned of the implanted microchip and the Mark of the beast. There have been cases similar to what Barry Smith has predicted. An example would be in 2008 when Verichip was set to implant patients suffering from Alzheimer’s disease. Also Meritum Media website reported on a case where Suzan Shipper, a 57 year old woman who had her 84 year old husband who was suffering from Alzheimer’s disease chiped, decided to have herself chipped as well. There have been reports of implants given to nite club patrons. Perhaps this could be considered to be the materialisation of his prediction. In The Global 2000 Report publication, Barry Smith listed several problems that would arise after the adoption of the plastic card system making it a temporary system. Because of the security limitations offered by plastic cards as mentioned on the Shasta website, he wrote "Reasons such as these will necessitate the cards being replaced by the marking system".

Barry Smith was a married father of four. His wife was Samoan and he was also fluent in Samoan language.

• Warning (1980), ISBN 0-908961-03-0
• Second Warning (1985), ISBN 0-908961-01-4
• Final Notice (1989), ISBN 0-908961-02-2
• Postscript (1992), ISBN 0-908961-04-9
• ...Better Than Nostradamus (1996), ISBN 0-908961-05-7
• The Devil's Jigsaw (1998) ISBN 0-908961-08-1
• I Spy with My Little Eye (1999), ISBN 0-908961-07-3
• Unlocking the Ultimate Secret (2002), ISBN 0-908961-09-X

Video & DVD

• Back Door to the New World Order by Barry Smith