This a place holder, I will expand this post when I get time to write.
I have been a QSA since 2013, and before that I worked for a multi-national bank from 2007 to 2009, which had a programme to secure card payments, hence my early involvement of PCI World.
so what do PCI stands for ? Payment Card Industry, and maybe your next question will be what is PCI DSS and what is the security council SSC ( Payment Card Industry Security Standards Council )? and ofcourse what is PCI QSA? I will answer these questions in an expanded post. For now, a quick reference go to the PCI SSC website here