Meet the Ataraxis Leadership Team

Stephen Cilley is the founder and Chief Executive Officer of Ataraxis, leading the company’s next phase of growth. With more than 25 years of experience across HR, payroll, and workforce solutions, he brings a deep understanding of the challenges business owners face. He founded Ataraxis to be a true partner — one that does the work, not just advises. Today, he focuses on long-term strategy, client relationships, and building a company that supports both businesses and their people.

Eric Smith is a revenue, operations, and growth executive with 25 years of experience spanning entrepreneurship, human capital management, and organizational leadership. As Chief Revenue Officer and former CEO and COO at Ataraxis, he has helped drive 200%+ growth, increase client retention to over 98%, and expand the organization to a national presence servicing worksite employees in about 45 states. He's known for transforming complex systems into scalable, high‑performance platforms that support long‑term growth and service excellence.

Focuses on leadership development, organizational growth, and people strategy. As the founder of The H Factor, he brings deep expertise in executive coaching, team alignment, and talent development, helping businesses build strong cultures and scalable leadership practices. He works closely with the executive team to align talent with business goals, strengthen leadership capability, and support long-term growth with consistency and intention.

Marv serves as Chief Technology Officer at Ataraxis, guiding technology strategy and ensuring systems support the company’s growth and client needs. As the founder of Kapex Technology, he brings deep experience in IT strategy, cloud infrastructure, and cybersecurity, helping businesses modernize operations and improve performance. He focuses on aligning technology with business outcomes — delivering practical, scalable solutions that drive efficiency, security, and long-term success.

Kailee Rosentreter serves as Vice President of Human Resources and Operations at Ataraxis, where she leads HR strategy and operational execution to support company growth. With over a decade of experience, she focuses on building strong teams, improving employee engagement, and aligning people strategies with business goals. Kailee is known for her ability to turn challenges into practical, scalable solutions that support both the organization and its employees.

Autumn Brown serves as Vice President of Finance at Ataraxis, bringing more than a decade of experience in payroll and financial operations. Since joining the company in 2015, she has progressed from Payroll Manager to Director of Payroll, and now leads financial strategy and operational oversight across the organization. Autumn has played a key role in scaling the business, including implementing new HRIS and timekeeping systems that improved efficiency and data accuracy. She is known for her strong institutional knowledge and focus on building systems that support sustainable growth and long-term success.

Lisa leads marketing and communications at Ataraxis, focusing on building brand awareness and delivering clear, effective messaging across multiple channels. She develops both digital and traditional marketing strategies that connect with clients, employees, and the broader community. With a strong understanding of organizational goals, Lisa ensures every message is intentional, consistent, and aligned with the Ataraxis brand.