Is it possible he likes me if so how could I start a conversation with him?

So basically he’s a physiotherapist at the hospital I volunteer and I notice in the hallways he’s always staring at me, i kind of thought there was a different reason for it but i was coming upstairs and he was chatting with his colleagues on the stairs and as soon as he seen me he just stared blankly like he was in a trance or wanted to say something and didn’t look away till I was pretty much gone. I seen him again as I was leaving and as soon as he seen me he turned his whole body facing me and had this really kind of serious looking startled/scared look on his face and was staring at me and anytime he sees me around he smiles like really widely with teeth not at me but it seems he tries to hide it. I’d like to talk to him as I think he’s attentive but I find him really intimidating
Is it possible he likes me if so how could I start a conversation with him?
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