How do you best guide an impulsive, defiant, stubborn child?

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How do you best guide an impulsive, defiant, stubborn child?
About a month and a half ago said child cut the hair of a classmate because her ponytail was grazing his desk. Today he got in an altercation with a classmate on the bus because he felt his space was being invaded.

This same child also had a history of biting his brother and occasionally other children.

One of us parents thinks severe punishments are in order, one of us thinks guidance is in order. When asked about it he shuts down, gets upset and scratches his face to try to “make up” for it.
How do you best guide an impulsive, defiant, stubborn child?
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