Genesis is a 1064 Yag laser used for redness and collagen regeneration. It heats from the surface down. It generally takes multiple treatments to get good results.
Ultherapy is an ultrasound technology that bypasses the top layers of the skin and focuses high frequency ultrasound waves to target the underlying fascia and deeper skin to cause tightening, lifting, and plumping. You see results in 2-3 months, and it is built as a "single" treatment, however more than one treatment may be recommended based on your results.
There is little research on using a laser at the same time as the Ultherapy. In theory, it seems that you could safely use the two lasers together, however, there may be an increased risk when you are heating the tissues twice at the same time.
I would probably recommend separating the two procedures by a week or so unless there is really a strong reason for you to need them at the same time (such as living really far away from the treatment center). If you do proceed with having them at the same time, think about first doing a "test" area.