Phillip Cassidy
Phillip Cassidy, MBA
Senior Managing Scientist
Chemical Regulation & Food Safety
District of Columbia

Mr. Cassidy brings nearly three decades experience in environmental fate, residue chemistry, metabolism, and synthesis (cold and radiolabeled). In addition to his experience supporting the pesticide industry, he has also worked on projects for the foods, veterinary, pharmaceuticals, and industrial chemicals industries. Mr. Cassidy has worked in the agrochemical industry since 1988. His career includes experience in the areas of pesticide registration and the conduct of laboratory studies. His areas of expertise include environmental fate, radiosynthesis, metabolite synthesis, crop residue and processing studies, livestock residue (feeding and dermally applied) studies, and soil, water, plant and animal metabolism. He has overseen the testing portion of pesticide and animal health projects for North American, European and Asian registrations. The studies have been required to support new compound registration, to fulfill data gaps from the original registration, generate higher tier testing needed to mitigate risk, or to fulfill Data Call-Ins for Registration Review. Over his career, Mr. Cassidy has overseen the testing programs that resulted in the registration of more than 25 new compounds utilized as pesticides, antimicrobials, or animal health drugs, as well as registration and registration review support for many of compounds that are registered generics.

During his tenure at a major contract laboratory he oversaw all of the agrochemical activities of the firm including efate, metabolism, residue chemistry, and mammalian toxicology. His acquired expertise includes such areas as determination of metabolic pathways, routes of metabolite synthesis, performance of studies for regulatory requirements, structural elucidation (particularly interpretation of MS spectra), determining compound clean-up and isolation, and chromatography (HPLC and TLC). This expertise makes Mr. Cassidy highly capable in the areas of identification of unknown metabolites, postulating degradation pathways and reviewing study data for determination of guideline adherence, and developing and executing robust regulatory strategies.

In his many years of experience, Mr. Cassidy has had to find innovative solutions for compounds that were not typical organic, small molecules. These challenges have included:

  • Determination of chirality of parent and metabolites over the course of a study.
  • Collecting study data (environmental fate and residue) on volatile fumigants.
  • Determining the environmental fate of organometallics.
  • Determining environmental fate of polyethoxylated fatty acids where no set molecular weight was available for the test substance due to variations in side chain length.
  • Determining environmental fate of natural products or fermentation byproducts.
  • Determining residue data for compounds that did not contain a UV chromophore or a charge potential for MS analysis.

Mr. Cassidy has been a member of the National Association of Independent Crop Consultants (NAICC) for more than 10 years. He has also been a member of the Ohio-Israel Agricultural Initiative Advisory Board since 2012.


  • M.B.A., University of Phoenix, 2004
  • B.S., Chemistry, Bowling Green State University, 1986


Gaikowski MP, Mushtaq M, Cassidy P, Meinertz JR, Schleis SM, Endris RG. Depletion of Aquaflor® (50% Type A Medicated Article – Florfenicol), from Tilapia (Oreochromis niloticus x O. niloticus and O. niloticus x O. aureus) following administration in feed. Journal of Aquaculture, March 23, 2010.


Cassidy P. Residue studies in North America based on EPA guidelines and harmonized OPPTS guidelines. Japanese Pesticide Science Society, Tokyo University, April 2, 2008.

Cassidy P. Why authentic reference standards are essential for unknown identity in metabolism studies. International IUPAC Conference, August 13, 2014.

Prior Experience

Senior Director/Director, Agrochemical Division, Ricerca Biosciences, 2003–2017

Manager/Study Director, Ricerca Biosciences, 1998–2003

Scientist, Ricerca Biosciences, 1988–1998

Additional Information

Advisory Appointments

Appointment to CCRVDF International Committee for establishment of harmonized guidelines, 2008

News & Events


  • M.B.A., University of Phoenix, 2004
  • B.S., Chemistry, Bowling Green State University, 1986