Donald Fehr (born July 18, 1946) graduate of Indiana University, and alum of Sigma Alpha Mu Sigma Zeta chapter is the executive director of the Major League Baseball Players Association. He has held the position since 1986. As a young lawyer, Fehr assisted the MLBPA in the Andy Messersmith and Dave McNally arbitration case (later known as the Seitz decision). In 1977, Marvin Miller hired Fehr as the Players Association general counsel. Wikipedia
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It was during the Messersmith/McNally hearing, and the clubs attempt to overturn the ruling, that Miller met Don Fehr, the MLBPA's current executive director. mlbplayers.mlb.com/NASApp/mlb/pa/info/history.jsp