Bob Beckman made plenty of money as an investment adviser, and his flair for exuberant self-publicity meant that plenty of people knew it. But he was equally well known for a series of doom-laden predictions of disastrous crashes in property and shares that, followed as they often were by riotous and sustained bull markets, ensured that his advice was often as much mocked as admired.

Robert Charles Beckman was born in New York during the Great Depression and was brought up poor, working his way to an economics degree. He became an investment banker and stockbroker on Wall Street, and later claimed to have made a million dollars by the age of 26, and to have lost it all by the age of 27.

The experience, he said, imprinted on him a deep mistrust of the uncertain volatility of the stock market. “Making the next million took me more than 13 years,” he said in 1992. “I decided not to rely on my luck any more. I adopted a policy to get rich slowly but, almost certainly, surely.”

In 1963 Beckman moved to London where he began advising on the stock market. He founded the Investors' Bulletin in 1968, in which he shared his thoughts with thousands of subscribers until he sold the business in 1996.

His talent for publicity manifested itself in the 1970s when his Old English sheepdog, William, started making excellent returns on the stock market, making more than £100,000 over seven years. Beckman claimed that he would read out company names, and “if he barks at one of them, I invest in his name”. The press inevitably dubbed it a “wags to riches tale”. The taxman's attempts to claim a slice of the profits — unsuccessful as long as none of it was spent — added to the appeal of the story. Beckman's aim, he said, was to demonstrate “that anyone could make money on the stock exchange”. Beckman soon became a media personality himself, with a regular morning slot on LBC radio, on which he dispensed advice for 12 years, also presenting on TV-am.

In both forums Beckman was consistently gloomy about the outlook for property and shares. In 1979, in a work titled Powertiming, he predicted that house prices would halve within three years, a claim that caught the attention of headline writers. Although prices continued to rise, in 1983 Beckman amplified his misgivings about the British economy in Downwave, in which he predicted a disastrous crash on the stock market and stated firmly that “By 1987 there will be no real residential housing market in Britain for the owner occupier. Some houses will be unsaleable at any price.” The book sold 500,000 copies, but the share and property boom that followed was one of the most spectacular Britain had ever seen.

Beckman claimed some justification after the 1987 crash. However, as the FT pointed out, even after the crash, equity prices had roughly doubled since 1983.

Beckman was a skilful investment manager. In 1982 he started the Beckman International Accumulator Unit Trust, which soon became one of the country's largest, with tens of millions under its control. He became very rich, and his design-consultantfurnished, three-storey — rented — penthouse in the Barbican and his luxury cars were often displayed in the papers.

His investment policy strictly eschewed equities, dealing instead in fixed interest instruments such as gilts and bonds. “Bond markets are quantifiable. I know what factors influence them,” he said. He made money in these markets and, though his returns could not ultimately compete with the rich pickings available in the stock market, his conservative but consistent returns provided a steady flow of private clients.

Many devoted followers also flocked to Beckman's investment seminars, listened to his show and followed his advice. Some said they had made a lot of money; others complained of heavy losses. Beckman's tips on investing were simple and arresting. Only invest with money you can afford to lose. Never accept stock tips without investigation. And on how to spot a looming crash: “When every taxi driver begins chatting about the stock market or property values the moment you get into his cab, you know trouble is brewing.”

Beckman continued to write. Into the Upwave (1988), reviewed as “tosh of a very high order”; Crashes (1988), a historical survey of bursted bubbles from tulip madnesss onwards; and Powertiming (1992), an explanation of his method of of anticipating market turns. In 1996 came Housequake, in which he again prophesied years of property disaster and stated: “There will not be a property boom during the 1990s of any sort.” House prices have more than tripled since.

Beckman enjoyed an opulent lifestyle in Monaco, where he based himself permanently from 1987.

He is survived by his wife, Arlette.

Bob Beckman, investment adviser, was born on August 25, 1934. He died of cancer on December 6, 2007, aged 73