Transforming orgnizations with strategy, emotional intelligence & Creative Optimum Solutions™.
At COS™ 4 Excellence, we partner with global leaders to unlock transformation, elevate performance, and cultivate purpose-driven leadership.
Founded by Costantino “Cos” Delli, our boutique consultancy blends strategic precision with emotional intelligence to deliver results that scale—and inspire.
With 20+ years of experience guiding Fortune 500 companies and purpose-led executives, we lead from the inside out: transforming systems, cultures, and teams with elegance and impact.
🔹 4 E’s of COS 4 Excellence
🔹 Emotional Intelligence – Lead with empathy, authenticity, and presence.
🔹 Execution – Turn bold vision into precise, measurable action.
🔹 Efficiency – Design systems that flow, serve, and scale.
🔹 Empowerment – Equip people to rise, lead, and evolve.
It's a privilege to have delivered service excellence to top companies and organizations!
AT&T
"Cos is a shining example of true leadership - he has both the tenacity and an agreeable nature that draws people to the right solution / direction amidst chaos"
Bloomberg Financial Markets
"Cos is dedicated to perfection every time. We can count on him".
Deutsche Bank
"Cos is tenacious in driving positive results and deliver service excellence every time. If I was ever in a fire, I know he would get me out safely."
Guardian Insurance
"Between your business smarts, creative flair, engaging spirit and down to earth common sense, Cos makes the impossible, happen."
First Republic Bank
"Cos, thank you of your outstanding accomplishments in providing exceptional support. Your contributions are deep and highly valued. You've touched many lives and made a lasting impression."
JP Morgan Chase
"We were thrilled to have Cos for a couple of years. He is a true professional and offers a wealth of valuable experience. He always puts his client first."
Kaiser Permanente
"Cos is extremely thorough and top notch leader in recognizing the risks and opportunities of a situation before others do, and dedicated to address them timely.
Pacific Gas & Electric
"Cos' leadership in successfully managing complex large initiatives is impressive - delivering them on time and within budget every time."
Paramount Pictures
"Cos influences everyone around him to a higher level of standard. He has an innate ability to develop a rapport with all people and have them feeling they are part of something much bigger. That is a rare gift."
Goldman Sachs
"Cos is a seasoned executive. When frustration heats a situation up, he calmly diffuse it and reach a resolution. A very generous spirit that any organization can benefit from. "
Price Waterhouse Consulting
"Cos is an inspiring leader, mentor and respect other people's value and decisions while bringing out the best in people."
Science Applications International Corp
"Cos is a smart electrical engineer with outstanding personal skills and perfect for the consulting industry."
Tiffany & Co
"Cos enlivens the senses and instills leadership, productivity and exceeds all expectations. He truly understand luxury, service excellence and completes his work beautifully in a Tiffany bow."
Ziff Davis Media
"Cos is a dedicated achiever and I always enjoyed being able to put him into any situation or project and know that I did not have to worry about the outcome."
Live Nation Entertainment
"Cos has been a fantastic collaborator over the years listening acutely to the problems and able to corral all of the different stakeholders to make change happen. And he is a genuinely good person who always has the best interests of the team at heart."
Ticketmaster
"Cos was incredible as the contract lead on Ticketmaster's NFL Program, ensuring ever single contract line item was addressed by the team, meeting every contractual milestone and avoiding any penalties."
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