<p>I worked 1+ year in a tissue engineering lab during my junior year that’s like 4-5 years ago. however, the professor I worked with retired like 2 years ago and I lost touch with him. I am not sure if it is ok to mention this experience without prove. is it still gonna be counted?!</p>
<p>Is there a human resources department in place? There should be. If your old supervisor has retired, you can call the HR department and explain the situation. Ask if you can refer your future employer/school can reach them and verify your previous employment. They are obligated to keep your work documents just in case situations like these come up.</p>
<p>Actually I was volunteering there no documents.
It was just volunteer lab assistant!!</p>
<p>Did they issue you an ID, or otherwise track your presence on site? I would assume they had some kind of security, and should have records showing you were there. Even as a volunteer, they should have records - I’m sure they would have been required for safety reasons.</p>
<p>There are plenty of situations where people have worked for companies that no longer exist, and have no way of contacting their supervisors. As long as you provide some details, they can verify what you provide - even if they can’t directly verify how many hours you volunteered, HR can at least verify that the professor you worked with did work there, and retired.</p>
<p>You don’t have to worry about this as much, because in grad school admissions people don’t really check your references as much like they do when they are hiring you. Unless one of the professors at your target school knows one of the professors from the lab you worked in personally, they are most likely not going to call them.</p>
<p>Just put it down. In the unlikely event that you are asked to verify, you can explain the situation.</p>