Yes! If you are the leader of the task you can do this by clicking on the task, then you will be directed to the 'Share and Assign' tab. Next, click on the person you would like to make the leader of the task (or assign the task to) and there will be a pop up asking if you would like to assign this task to this member. Click 'Set as Leader'. The other members will receive a notification in their Notification Center.