Research-based insights on intelligence, IQ testing, and cognitive performance.
David Johnson is the founder of CheckIQFree and the sole author of all educational, research-based content published on the platform.
He holds a Master’s degree in Cognitive Psychology from the University of California, Berkeley, with over 10 years of experience in psychometric research, intelligence assessment, and cognitive testing design.
David specializes in the design and analysis of intelligence tests, focusing on logical reasoning, pattern recognition, working memory, and problem-solving ability.
His work is informed by established psychological frameworks and standardized assessments, including:
All IQ tests, guides, and articles published on CheckIQFree are written, reviewed, and scientifically validated by David Johnson.
The content is designed for educational purposes and aims to bridge academic research with accessible online intelligence assessment tools.
David Johnson contributes content across the following sections:
For professional inquiries, collaborations, or feedback: