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Who We Are

David Kertzner
Founder and Managing Director

David Kertzner founded ProActive English in 1997 to meet a pressing need in the business community as the dot-com era evolved: well-educated, non-native English-speaking professionals with significant roles and great technical ability were not functioning effectively in fast-paced environments due to their language and communication skills. 

Similarly, as manufacturing operations transitioned to smart production lines, ProActive English identified a growing need for line workers to communicate more effectively as machinery became increasingly complex and teams became increasingly multicultural and multilingual.  


Through ProActive English, David Kertzner has managed training programs at some of the world’s most successful companies, designing training delivery, developing content, hiring trainers and leading training himself at locations around the United States, throughout Asia, in Europe and Latin America.  David has also led teacher training workshops in Brazil, Colombia, The Czech Republic, Vietnam (2018 U.S. English Language Specialist) and at many conferences for ESL teachers.

David has passion and skill for generating creative training solutions that are simple, yet sophisticated and engaging for workers in complex global operations.  He develops language and communication learning experiences with immediate applications to the work environment which are, often, also personally transformational for training participants.

He earned a Bachelor's degree in Economics from Brandeis University, and received a Master's degree in Teaching English as a Second or Foreign Language from The School for International Training.   David now resides in Portland, Oregon with his family where he enjoys playing basketball, completing home repair projects, reading biographies and playing the guitar as if he were a rock 'n roll star.

ProActive English Trainers

ProActive English has developed a well-supported network of talented English language and communication skills trainers committed to helping business professionals advance their careers.   Our trainers work closely with client companies to improve their bottom line as team members become more confident and willing to engage when using English.

Trainers working with ProActive English thrive when presented with the unique challenge of delivering language and communication training for some the brightest people in every kind of company, from startups to major software and IT companies to interesting manufacturing organizations employing motivated new arrivals and long-term residents in the United States.

We are always on the lookout for experienced ESL instructors and corporate trainers to engage in our work.  If you are looking for an opportunity to lead training at some of the most interesting companies for some of the most inspiring employees around, then we are interested in you!  

Please don’t hesitate to contact us at

UCLA Extension’s American Language Center worked closely with ProActive English to deliver onsite pronunciation training at a biotech company, with The Business English Web as the Web-based component in a blended learning model. Program participants had a very positive experience with the Web tool. ProActive English’s professional and supportive approach has helped participants achieve qualitative outcomes and helped UCLA-ALC generate repeat business with the client.

B. Franceschini

Program Coordinator - Workplace and Evening Programs

UCLA-Extension, American Language Center


Increase employee  confidence and productivity with language training.  Save time and money for your organization.

Assured Quality

Delivering enterprise-wide training for thousands of employees or as few a five. Helping participants with their own improvement.