We recently worked together as part of a team to improve and reduce Lab Investigations for a client. Dr. Hartzfeld showed good problem solving skills and excellent technical competence in doing the Lab Investigations. Her communication skills in writing and verbally are very good.

Certainly when you retain a regulatory affairs consultant, you look for subject matter competence.  Donna goes well beyond that, offering company-specific advice, understanding time sensitivity, and providing the care needed in a start-up environment.  I strongly recommend her.

Donna has provided timely and effective quality management consulting to my firm over the years. She is both very knowledgeable and personable, making interacting with her productive and enjoyable.

Donna has been both adviser and regulatory consultant to Mission3. In both capacities she has been professional, knowledgeable, and thorough. Her ability to find the right answer and do work with incredible level of quality makes her an incredible asset to any team. She is personable and easy to work with