Karen Haller is a leading international authority in the field of applied color psychology, specializing in how color influences human emotions and behaviors. She has spent over two decades studying and applying the principles of color psychology to various industries, including branding, interior design, and personal styling. Haller is passionate about helping individuals and businesses harness the power of color to improve their lives and relationships. Her expertise is grounded in both scientific research and real-world applications, making her insights highly practical and accessible.

In her book The Little Book of Colour (also known as Psihologia culorilor in Romanian), Haller explores how colors shape our perception of the world and our own emotional responses. She believes that by understanding how color affects us on a deeper psychological level, we can use it to create environments that enhance our well-being and happiness. Her work has been featured in numerous publications and media outlets, and she continues to teach and consult internationally on the profound impact of color psychology.