David Jennings is a seasoned executive leadership coach and transformation strategist with more than 30 years of experience leading complex change, guiding agile transformations, and coaching senior leaders across industries. With a passion for helping people and organizations thrive, he brings a unique blend of strategic insight, operational excellence, and human-centered leadership to every engagement.

Darlene Sullivan is a seasoned sales executive and transformational leader known for driving top-line growth, optimizing customer satisfaction, and building high-performing teams within some of the world’s most complex organizations. With a proven track record across IT, digital, workforce, and security transformation, she has successfully led multibillion-dollar initiatives while navigating mergers, acquisitions, and organizational change. Darlene thrives in fast-paced environments, consistently exceeding performance goals and forging lasting executive relationships that fuel long-term success in the marketplace.

I’m excited to share my journey as CEO of Tandem Group, where I've dedicated my career to driving transformative change and aligning leadership teams for exceptional business results. Over the past 15 years at Tandem, I've partnered with renowned organizations across various industries, enhancing strategic planning and fostering cultures of innovation. My track record includes guiding companies like Johnson & Johnson and Eastman Chemical to achieve remarkable growth, and my expertise in organizational transformation has been instrumental in navigating complex challenges. I invite you to explore my insights on leadership, culture change, and strategic growth!