I believe this can be done using a custom action if you wish to automate this, or go into each project separately and using the 'replace resource' button.
how to replace one user with another
I need to find and replace a user with another everywhere the old user appears. The Apps listed here are no longer accessible: https://success.clarizen.com/hc/en-us/community/posts/203973248-How-does-one-find-replace-resources-
How is it done these days (I'm an early adopter of Clarizen from 2010).
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On the project level you can go to "Utilities" from there you will see replace Resources. You can then select the resource value to replace and what/who to replace it with
Thanks Guy and Devin