And whose fault is that? As a professional you should at least be aware (just aware, no need to be any kind of expert) of the pipeline you use. Which in this case is anything from your high level language of choice, all the way down to the actual electrons.

Knowing that, you should realize that a disassembler is just one or two of those steps reversed, the "assembler" steps, which should make if pretty much self-explanatory.