New York

•  Behavior Design is a New York-based agency whose tagline is, "We take complex ideas and make them simple to understand." It was recently acquired by Orion, whose CEO is Raj Patil.

Sao Paulo

•  Studio Ideias is a Sao Paulo-based behavioral design research agency whose tagline is, "Recreating the connection between brands and people."

Kuala Lumpur

• The primary language of Kuala Lumpur is Malay. Behavior design translated to "reka bentuk tingkah laku" in Malay, so we used this term to search when English searches turned up no solid results. However, we only got two hits with this translation and neither was relevant.
• We found a couple of lists of design agencies in Kuala Lumpar and searched these entries to identify any that offered behavioral design services.
•  Audience2Media is a digital agency that offers behavioral design services. They have offices in London and Kuala Lumpur.