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In my experience, it's been a combination of the following:

  1. Measures by results/output, rather than input.
  2. Motivating, inspirational leader that you can respect and look up to.
  3. Sensitive to team members' needs - support/training/career, etc.
  4. Quickly resolves conflict, diffuses difficult situations.
  5. Understands your job - they may be able to actually do your job, but hired you to do that.
  6. Handles/filters-out the stuff thats' not important or impairs the teams' productivity.