In an interview, one of us (JHE) recounts the state of NO chemistry around the middle of the twentieth century and the events that led to the development of Enemark and Feltham's n notation. A personal perspective by one of us (AG) underscores the continued role of the notation as a source of electro-structural correlations. Interestingly, although recent ab initio calculations have on occasion resulted in somewhat different NO oxidation states relative to earlier, classic studies, the Enemark-Feltham notation remains as relevant as ever. Thus, for iron nitrosyls, there appears to be a one-to-one mapping between the Enemark-Feltham count and the NO oxidation state. Whether an analogous mapping exists for other transition metals has not been resolved at this point.