Yes, simply change the email and author before commit and should work.
Note that git already provides a way to mark a commit with someone else authorship, but in that case you remain as the "original author" of the commit, usually shown as "X authored commit of Y".
I sometimes use that when I need to push other coworkers code for whatever reason, or when you start a codebase from an old project files that weren't versioned (so that you are not the author of all the atrocities of the old code ;)
Note that git already provides a way to mark a commit with someone else authorship, but in that case you remain as the "original author" of the commit, usually shown as "X authored commit of Y". I sometimes use that when I need to push other coworkers code for whatever reason, or when you start a codebase from an old project files that weren't versioned (so that you are not the author of all the atrocities of the old code ;)