About Us

90 Day Solutions provides auditing, training, process improvement recommendations, and documentation. We have helped numerous Fortune 500 companies attain ISO (International Standard Organization) certification in quality management systems since 2000. 

Our President, Lisett Guevara, has a doctorate level schooling in education, a master’s degree in industrial engineering, and undergraduate degree in information engineering.  

As an expert business consultant, she has also helped more than 200 companies and 1500 couples and individuals with their communication and relationships since 1998. She has helped many clients, past students, and customers to rebuild and strengthen their marriages and work relationships, open up their communication, and learn to understand themselves and each other better.  

Lisett has over 18 years of experience as a professor at both undergraduate and graduate levels, led and implemented educational projects about: teamwork, rules of negotiation, effective communication, and helps implement strategies to discover the effectiveness of people. 

Jim Gulnick, Vice President and creative program developer, has more than 20 years’ experience in engineering, marketing, and sales psychology. He takes a balanced approach to objective analysis and solution creation, and its is well skilled in his ability to read people and their behavior.

Jim has a master’s degree in business administration and an undergraduate degree in electrical engineering achieving membership in honors societies for both disciplines. As a Competent Toastmaster, former elected Class Speaker for Leadership Lycoming, and past President of the Williamsport Merchants and Business Association (WMBA), Jim has held a variety of leadership positions, such as serving as a business owner and board member where knowing how to develop strong interpersonal relationship skills was vital.

As authors, this husband and wife team have appeared as repeat guests on radio shows around the world in places such as Venezuela, London, Philadelphia, Oklahoma City and Dallas. They conduct seminars internationally and are available for interactive conversation with audiences. Interviews and seminars may be conducted in English or Spanish.


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ISO 9001 - Quality ISO 14001 - Environmental ISO 13485 - Medical Device ISO 27001 - Information Security TL 9000 - Telecommunication


"90DAYSOLUTIONS helped our employees focus on the big picture and made an immediate impact on our success and bottom line."

--J. R. Dallas, TX

Pedro Ruben, Philadelphia, PA Carico Health Products Distrib.


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