yield the floor

[Jack8rkin]

Hello!
I have a question about conferences/meetings.
On a conference/meeting, in the very beginning, the Chair introduces attendees and on the completion of this proceedure he/she has to call another speaker to proceed the conferece/meeting. What is the common way to say (formally and not so formally) that the other speaker is going to speak now?
[Now, I yield the floor to ___.]???
I tried this at one time but it seemed to be far toooo formal.
Could you help me with this, please?

Thanx

[Jack8rkin]

During the last meeting I heard "I give the floor to ..." and it sounded ok because it was a top-level meeting. I also found an expression "I pass over to ...". Well, could you say anything on that?