Change committer and author of all commits in a repo

fix-author-committer.sh

#!/bin/sh

# Credits: http://stackoverflow.com/a/750191

git filter-branch -f --env-filter "
    GIT_AUTHOR_NAME='__AUTHOR_NAME__'
    GIT_AUTHOR_EMAIL='__AUTHOR_EMAIL_ADDRESS__'
    GIT_COMMITTER_NAME='__COMMITTER_NAME__'
    GIT_COMMITTER_EMAIL='__COMMITTER_EMAIL_ADDRESS__'
  " HEAD

run
git update-ref -d refs/original/refs/heads/master

afterwards