Resurrecting old research done at another university. Do I need permission from previous supervisor to publish, and how should I credit?
There should be no problem whatsoever, but it would be correct to both inform your previous supervisor and make him/her a co-author. Importantly, they should read and be allowed to suggest edits to your manuscript which may both enhance it scientifically and its chances of success at review. It's a win-win approach in my experience since you both benefit. In no way does this dilute the level of your 'ownership' of the paper or your intellectual input, and indeed, if your supervisor is well known in their field, you may also benefit from the association.