#theorist

• Actionalist — A proponent of actionalism; a researcher, sociologist, or philosopher who places the intentional action of the social actor at the center of their theoretical analyses. As an adjective, it describes a structural approach, methodology, or paradigm that explains collective transformations and the genesis of institutions through the lens of initiatives, conflicts, and decisions undertaken by autonomous individuals.
• Harmonist — A person who specializes in the study of harmony, composes harmonic structures, or supports the philosophical doctrine of harmonism. In a historical musical context, it referred to a theorist focused on acoustic laws, while as an adjective it describes methods oriented towards establishing structural balance.
• Female harmonist — A woman who specializes in the study, teaching, or practical application of the laws of musical harmony; a composer or theorist focused on chord progressions. Broadly, it also denotes a female proponent of the philosophical or social doctrine of harmonism, emphasizing structural balance and peaceful concord.
• Aubignac — A proper surname of French origin; it refers specifically to François Hédelin, known as the Abbé d'Aubignac (1604–1676), a French writer, playwright, and theater theorist. His fundamental work, 'The Practice of the Theatre', codified the rules of French classicism, rigorously defending the rule of the three unities (action, time, and place) and the concept of verisimilitude in dramatic art.