I'm a private investor, who manages some of his assets using an active trading strategy since 2007. While I'm not a "quant" trader in a classical sense, my engineering background enables me to use quantitative techniques in my discretionary swing trading approach.
My strategy has been inspired by various traders: Alexander Elder (channel techniques), Adam Grimes (focus on buying/selling pressure) and Victor Niederhoffer ("you have to test everything").
Holding periods of a few days to weeks requires constant price monitoring, which could be challenging as a part time trader. However, for me this is easily possible since I'm located in Germany and US markets are open from 3:30 until 10pm local time.
Since my trading approach has been working very well right from the beginning, I was asked in 2009 to be one of the first model managers on the new Covestor model subscription platform. As of December 2012, the "Technical Swing" strategy returned over 85% since inception while the S&P 500 lost 1% during the same time. Of course, I still keep improving the approach to adopt to new market conditions.
When I'm not trading US stocks, I'm enjoying time with family, trying to learn playing Spanish guitar or doing long distance runs.