This paper examines the increasing convergence between people management and marketing effectiveness, arguing that human-centred management capabilities constitute a critical source of competitive advantage in contemporary markets. While marketing theory has traditionally focused on consumer behaviour, segmentation, and value creation, emerging evidence suggests that internal people practices—such as emotional intelligence, empathy-driven communication, collaborative culture, and employee empowerment—significantly influence external brand performance. Drawing on case analyses from organisations including Apple, Disney, Airbnb, Starbucks, Zappos, and Dove, the paper demonstrates how customer perceptions are shaped not only by product attributes but by the quality of interpersonal interactions originating within the firm. The study contends that customers must be understood as complex social actors embedded in emotional, psychological, and cultural contexts, and that marketing strategies aligned with these human dynamics produce superior engagement, trust, and loyalty outcomes. The paper concludes that people management should be recognised as an essential marketing capability, warranting deeper integration into marketing education, strategic planning, and organisational practice.