Jean Keuléyan Lafon was born in Paris into a family with an established artistic lineage. His father, François Lafon, and grandfather, Jacques-Émile Lafon, were both practising painters, and his early training took place within this familial studio environment. From a young age he was exposed to the discipline of drawing and the structured approach to composition that underpinned academic practice, developing his technique through close observation and repetition. This grounding provided a foundation that would remain evident throughout his career, particularly in the clarity of his compositions and his measured handling of paint.

Lafon exhibited regularly in Paris, including at the Salon de l'École Française, where his work was shown alongside that of other contemporary painters working within established exhibition frameworks. His paintings were also presented at the Galerie Giordano di Palma in both Paris and Vichy, extending his audience beyond the capital. These exhibitions contributed to the steady recognition of his work during his lifetime, positioning him within a network of artists focused on landscape and coastal subjects at a time when such themes remained central to French painting. His work centres on rural and coastal motifs, including harbour scenes, village architecture and shoreline views, often derived from locations in southern France. He developed a sustained engagement with these settings, returning to similar viewpoints to study variations in light and atmosphere. Particular attention is given to transitional times of day, such as dusk and early evening, where subtle shifts in tone define the structure of the scene. His use of controlled brushwork and a restrained palette allows for gradual transitions between forms, with emphasis placed on the relationship between built elements and their surrounding environment.