About Pillar Learning

Message From Our Founder

Hi, my name is Dayu, and I am the creator of Codi.

I grew up with classic PBS kids shows including Mr. Rogers, Reading Rainbow, and Sesame Street.

Five-year-old me loved them because they were fun, entertaining AND (I had no idea at the time) they were good for me!

Only recently have I fully appreciated how much Mr. Rogers’ gentle words, or even just LeVar Burton's story readings, have aided in my own growth and development. As parents, and future parents, of a very technologically driven generation, I became worried that the educational entertainment of the past was on its way out.

That’s why I started Pillar Learning, Codi’s parent company. I wanted to leverage new technology to best support our future generations. At Pillar Learning, we believe in sticking to the roots of wholesome content and using technology in the right way.

Our Management Team

Dayu Yang

CEO and Head of Software

Dayu is a former mobile apps product manager, leading products reaching millions of users. He holds a BA from Stanford and a MBA from Wharton.

William Mock

Head of Content and Education

William is a former kindergarten teacher and academic consultant who has taught and advised hundreds of students. He holds a BA from Berkeley and an MA in Education from Stanford.

Chris Oslebo

Head of Product Development

Chris is a former product manager at a top toy company who has developed, launched and manufactured over 3,000 children's toys. He holds a BA from Stanford.

Our Team of Experts

Sasa Slavnic

App Engineer

Sasa has 17 years of development experience delivering complex solutions for clients around the world.

Conal Sathi

AI Engineer

Conal has 8 years of AI experience developing machine learning language models. Sathi holds a MS in Computer Science (AI focus) from Stanford.

Anand Vemuri

Full stack & Security Engineer

Anand has 5 years of experience developing highly secure systems for industries, such as healthcare, where privacy and security are paramount. Vemuri holds a BS in Engineering from University of Pennsylvania.

Eddie Visser

Art Director / Designer

Eddie has 16 years of art direction and design experience at top entertainment companies such as Ubisoft and Electronic arts, as well as at Anki (developer of Cozmo).

Annamaria Farbizio


Annamaria has 15 years experience writing fiction and nonfiction for children. Her works have been distributed through Barnes and Noble, Koorong, and Scholastic under the pen name Marilee Joy Mayfield.

Andrea White-Spears


Andrea has over 15 years of experience working in education, specializing in Literacy Curriculum & Instruction and Special Education. She is currently a Senior Course Lead for Western Governors University.

Chuck Brown

Story voice

Chuck has 36 years of voice acting experience and created lightupyourbrain.com, one of the top online collections of free children’s audio stories.

Guy Chace

Codi’s voice

Guy has 5 years of voice acting experience and a love for voicing toys. He provided services to Hasbro and Toy State and is the official voice of Harvey the Hammer.

Charles Moore

Public Relation and Marketing

Charles is a former merchant for the world’s
largest retailer with 10 years of retail experience. He’s holds a BS from
Valdosta State, a MIR & MIB from Bond University and a M.Acc. 

Suzie Vigon

Story voice

Originally from Toronto, Canada, Suzie has been featured in hundreds of voiceovers for companies around the world. As a lead puppeteer and voice actor, Suzie specializes in creating engaging characters.

Zach Marsh

Songwriter / Music Producer

Zach has 8 years of music production and education experience related to children’s content. Recent credits include VeggieTales: In The House, The Stinky and Dirty Show, and Scooby-Doo and the Gourmet Ghost.