git_author_rewrite

# https://help.github.com/articles/changing-author-info/

git filter-branch --env-filter '
OLD_EMAIL="[email protected]"
CORRECT_NAME="jxu"
CORRECT_EMAIL="[email protected]"
if [ "$GIT_COMMITTER_EMAIL" = "$OLD_EMAIL" ]
then
    export GIT_COMMITTER_NAME="$CORRECT_NAME"
    export GIT_COMMITTER_EMAIL="$CORRECT_EMAIL"
fi
if [ "$GIT_AUTHOR_EMAIL" = "$OLD_EMAIL" ]
then
    export GIT_AUTHOR_NAME="$CORRECT_NAME"
    export GIT_AUTHOR_EMAIL="$CORRECT_EMAIL"
fi
' --tag-name-filter cat -- --branches --tags

# Review history before pushing!
git push --force --tags origin 'refs/heads/*'

git rebase -r --root --exec 'git commit --amend --no-edit --author "jxu <[email protected]>"'

preserves author-date but not commit-date (https://stackoverflow.com/questions/28536980/git-change-commit-date-to-author-date)