Stephen Lemay

Lemay has played a role in shaping several major phases of Apple's software design language.^{[citation needed]} He contributed to the maturation of the Aqua user interface introduced in early versions of macOS, helping define its visual depth, motion, and interaction principles.^{[citation needed]}

In later years, he was involved in internal efforts to modernize Apple's interface systems, including work associated with translucent materials, layered surfaces, and glass-like visual effects. Some media outlets and developers have referred to these internal design directions as part of Apple's evolving "Liquid Glass" aesthetic, particularly as seen across recent versions of iOS, macOS, and visionOS.^[2]

In 2025, Lemay was promoted to Head of User Interface Design at Apple following a leadership transition within the company's design organization. His appointment was viewed as a continuation of Apple's existing design philosophy, given his deep institutional knowledge and long involvement with the company's software interfaces.^[2]

Colleagues and commentators have described Lemay as a detail-oriented designer with a strong emphasis on usability, consistency, and long-term system thinking across Apple's ecosystem.^[1]