Reassigning Tasks

Hi,

We have one Collector that has left the company suddenly and we need to re-assign all his Open tasks to another Collector so that we can continue working on them.

We can do this manually by searching on the Account in the UWQ, drilling down into Tasks, finding the correct one and updating the Owner field but this is a time-consuming effort and we need to know is there a quicker way to perform a Mass Reassignment/IUpdate of this process?

Thanks

Steve