You can follow these steps to see the user that committed a batch:

1.  Select Batch from the Administration functional area
2.  Select Batch Entry
3.  Select the committed batches tab
4.  Click the link in the committed field
5.  View the Started by field on the batch commit status.  This is the user that committed the batch.

Alternatively, you can query using the business process status query view filtered on Business Process \ Name is equal to Batch commit process and output the Started by field.