Whisk together first 6 ingredients. Reserve half of mixture, and chill.
Place chicken in a shallow dish or heavy-duty zip-top plastic bag; pour remaining mixture over chicken. Cover or seal, and chill at least 1 hour.
Remove chicken from marinade; discard marinade. Grill over medium-high heat (350° to 400°) 6 minutes on each side or until done. Cut into thin slices.
Combine celery and next 3 ingredients; add reserved dressing, tossing to coat.
Place chicken over greens. Top with celery mixture; sprinkle with berries.
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