In Jarrison Time a custom logo can be added to reports.
To add a logo on a report, the option must be enabled and an image selected.
To setup a logo follow these steps:
1) Go to Setup > System Configuration > Reports

2) Tick the checkbox for Use Logo on PDF reports, and then Browse for the image to use. The maximum image size is 60×30 pixels.
3) After saving, go to the Report Creator (under Setup).
4) Reports will now have a Print Logo option to tick in the Information Bar area. Once a logo is in use, an option to use it on each page will become available.

The report can then be run as normal, and will include the image in the upper left.