Ask him to create a detailed transition document for anyone else taking over his projects. List out any helpful tools, tricks, processes to get the job done. A

Ask him to create a detailed transition document for anyone else taking over his projects. List out any helpful tools, tricks, processes to get the job done. Assuming that you need to back-fill this position, it might be worth asking him a professional referral. Who do you know that would be an ideal match for this role? Finally, if he's amenable and there's good tonality-- a fair/favorable review on Glassdoor.