My background in Parallel computing 
1980 experimenting with 8x 6809 CPU's with shared memory
          (wire wrapped) developed a RAM memory bank passing system.
1984 built  a cluster of 20+ Commador 64's.
1988 -92 had opportunity to work on a Cray YMP.   Then ported finite element of code for Maxwell's equations to a SGI 4 CPU SMP box.
1993 At Sun Micro Systems I used 384 globally distributed servers to deliver live and recorded video to 13,000 viewers.
1994 Wells Fargo I worked on architecture to use 600 HPUX boxes located in the bank branched to reduce load on the Main Frames.
1995 to Present, have been using cluster of loosely coupled server for
video compression, serving, Neural Networks and Genetic Programming