For me, simultaneously the best and worst thing about our field is how easily
everything either falls under the umbrella of psychology or can be harnessed and utilized as part of it. Our field is unbelievably diverse. This is good because I can study virtually anything I want to and call it psychology. As a soft money faculty in an AMC I sometimes joke that my job description is basically "Do whatever the hell you want, just make sure you pay for it yourself." This is bad because - being who I am - I feel the need to study everything and thus often feel like I don't have an expertise.
Fields I have collaborated with now or in the recent past:
Oncology, internal medicine, thoracic surgery, genetics, molecular biology, marine ecology, computer science, computer engineering, nursing, public health, neuroscience, cognitive science, counseling, education, infectious disease, biostatistics, sociology, bioinformatics, exercise science, user-centered design/human factors.
In the one sense, this is awesome. Quite literally, yesterday I was on a Zoom call with NIH and a computational neuroscientist discussing an upcoming grant application where we will be attempting to translate new mathematical models of memory into a novel exposure therapy protocol we think has the potential to vastly improve efficacy. After the call I emailed with a collaborator who exclusively studies marine ecology but given they are routinely 10+ years ahead of anything we do to study activity patterns, is working with me to develop a new digital health transdiagnostic assessment method. He sends me an article on bird flight patterns that I promptly scan because yes - it turns out that understanding things like bird migration and how sonar affects whale movement patterns is relevant to my job as a clinical psychologist and I desperately wish I knew more about it. I then put on my therapist hat and called a couple patients to get back on my schedule and did some brief supportive therapy/problem-solving by phone. This is not an atypical day for me, by any stretch of the imagination. The downside is that it can be utterly exhausting because keeping up on all these things is impossible. I could work 16 hour days, 7 days/week and still feel like I'm falling further and further behind. So it has pros and cons
In retrospect, I should probably have been a bit more focused from the get-go and then branched out more carefully, but that ship has sailed at this point.
edit: I forgot physics, radiology and philosophy!