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Our people

Current responsibilities
Yishai is co-CEO of JLL Spark, our global business line focused on identifying and delivering innovative digitally-driven real estate services. 

Based in San Francisco, JLL Spark is additional and complementary to JLL's extensive existing range of proptech capabilities.

At Groupon, Yishai developed and built teams to grow Groupon's mobile business from 0% revenue to 50% of gross merchandise value (GMV). He also incubated numerous expansion businesses including merchant products, the core API and Merchant OS. 

In 2013, Yishai was acting global engineering SVP and CTO orchestrating all core Groupon software development worldwide. In this role, he ran a global ecommerce platform processing over $5B in GMV annually.  Additionally Yishai led due diligence for many of Groupon's corporate and technology acquisitions. 

Prior to the acquisition of by Groupon, Yishai was its CTO and Co-founder. built a number of category-leading, location-based mobile applications. 

Before co-founding, Yishai helped found Carrier IQ a mobile carrier focused data analytics platform.  Prior to Carrier IQ, Yishai developed a deep focus on Mobile product technologies leading to him becoming the first engineer at Core Mobility where he helped develop many native product lines for Wireless Carriers including a Push-To-Talk service for Sprint/Nextel. 

Core Mobility was later acquired by Smith Micro. He also led merchant engineering at, a lead generation service for local businesses and began his career building Artificial Intelligence systems for video games at Activision Studios.

Yishai Lerner holds a Bachelor of Science in Electrical Engineering and Computer Science from Massachusetts Institute of Technology where he concentrated in Artificial Intelligence and contributed at the MIT Media Lab.