I started my first company a few months after leaving university at the age of 21, and over the next 25 years, founded a total of four companies (Skok Systems, Corporate Software Europe, Watermark Software, and SilverStream Software) and did one turnaround (Xionics). I have had my share of ups and downs. I was lucky enough to have three of these companies go public, one was acquired, and one initially succeeded, but then failed when I moved the company to the US. I often remark that I learned more from that one failure than I have from all of my successes.