Keith Woolner
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Keith Woolner is an author for Baseball Prospectus and is the creator of the runs-based statistic VORP or Value Over Replacement Player.[1] [2] VORP is acknowledged by the sabermetrics community as one of the key concepts in the analysis of a player's performance and market valuation.
For more on Woolner's work, see his writing at the Baseball Prospectus website. Current and historical VORP statistics are maintained on that site.