I have always been drawn to the Gottmans’ work. When I was in graduate school, I noticed that a lot of practitioners hung a shingle out by their practice and advertised that they were a ‘couples therapist’ without having any real training in couples therapy. At the time, there wasn’t as much research about couples work as there was about work with individuals. But the Gottmans changed that in some of their revolutionary work on couples, in the ‘love lab’. They were real pioneers who offered a data-based way to think about couples interactions.
Here is one of their latest posts about anger. https://www.gottman.com/blog/the-anger-iceberg/ I find it very relevant in the treating of couples because often, if the angry member of the couple can get better in tune with the vulnerability underneath their anger, it makes it much easier for their partner to have empathy. Enjoy.