It depends if you are asking for beach volleyball coaches or indoor.
For beach it would have to be Mike Dodd or Singon Smith. They have both been successful at helping teams reach finals and even helped teams achieve the goal of being best in the world for the FIVB.
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one current succesfull sports leader could be Bill Bellicheck of the New England Patriots he has led his team to three super bowls and had one undefeated season.