Donna is wonderful, I was a new Zemax user and wasn’t going to consider investing the large amount of money to make new custom two photon detectors without talking to a pro. Donna was patient, kind, understood my unique, high-specialized requirements and now those detectors are being used by biologists every day. She is very skilled at optics and understands complex optical needs, how to work with a wide variety of optical components, interactions, needs and demands in a challenging context, and very easy to work with.