Dr. Prestwich has provided declarations, affidavits, reports, depositions, and testimony in over 16 cases since 2007. He has reported or testified on cases that have included:

1. Patent invalidity and non-infringement for synthetic prostanoids used for glaucoma treatment
2. Patent re-examination based on obviousness invalidity for analogs of synthetic phosphoinositides used for drug discovery and cell biology
3. Patent invalidity and non-infringement in a drug eluting stent case
4. False and misleading advertising claims for a functional food product
5. Patent validity and non-infringement for use of HA for drug delivery
6. Patent validity and non-infringement for a crosslinked HA used in treating osteoarthritis
7. Patent invalidity for blood substitutes
8. Patent infringement & validity for HA-based dermal fillers
9. Patent non-infringement & invalidity for a nutraceutical formulation
10. Patent invalidity via post-grant review of a patent for pesticidal compounds
11. Patent infringement & validity for plant growth regulator formulations
12. Patent infringement & validity for methods for detection of genetic disorders