He successfully predicted the crashes in the 1929 and Dot-Com stock market bubbles.  And according to his analysis, the US stock market is due for another crash in 2020.

Every movement in the market is the result of a natural law and of a Cause which exists long before the Effect takes place and can be determined years in advance. The future is but a repetition of the past, as the Bible plainly states…

After suffering through the worst economic and financial crisis since the 1930s depression when the real estate and stock markets crashed in 2007, the United States' bubble economy is back into full swing. Residential and commercial real estate prices are growing strongly, along with equities.

The US stock market, as defined by the S&P500 index, has boomed after collapsing to a trough in 2009. The market 'recovered' more quickly than anyone thought it would, and has continued surging from thereon in.

This has led to a lot of commentary and media coverage that the S&P500 is in the thrall of yet another bubble that will burst. Despite the many predictions of collapse, the bubble has powered on unhindered.