Our Management Team

ESG's leadership team has deep roots and solid experience in marketing, human resources management, healthcare, and finance. Along with expertise, each person brings a passion for their clients' success that drives their day-to-day activities.


Steve Pierson

ESG President

Steve has over 18 years of leadership and management experience. Steve is also an expert in technology and systems. In his free time, you may find Steve reading a good historical novel or growing potatoes (he’s a farmer at heart).

Mark Trimble

ESG Vice President of Operations in Arizona

Mark has more than 8 years of experience with operations management, employment law & regulatory compliance, and business process design. In his free time, Mark enjoys politics, spending time with his family, or playing a little hockey or tennis.

Meribeth Lunn

ESG Vice President of Operations in Colorado

Meribeth has more than 20 years experience in the PEO industry, with expertise in PEO sales, human resources, and employee benefits. Meribeth enjoys reading, horseback riding, hiking, and fly fishing.

Daryl Sisk

ESG Vice President of Sales

has over 15 years of PEO experience, particularly in Sales Management and Training, Human Resources Consulting, Benefits Administration, Marketing, and Public Relations. When not at work, Daryl likes to travel with his family, play basketball and golf, and coach his kids’ sports teams.

Matt Thompson

ESG Director of Operations

Matt has more than 10 years of experience in information technology and systems, network design, database design, project management, and process improvement. Matt loves to play basketball, baseball and softball, and also enjoys scouting, hiking, backpacking, and spending time with his family.

Sharron Ngatikaura

ESG Human Resources Director

Sharron has over 10 years of Human Resources experience. Her expertise includes recruiting and hiring, training and development, employee relations, compliance, and employee benefits. When she takes off the HR hat, you may catch Sharron gardening, cooking, or traveling somewhere new.

Monica Petro

CIC and Aspen Cove Property/Casualty Manager

Monica has over 30 years experience in the insurance industry, with expertise in general liability, workers’ compensation, commercial auto, professional liability, and inland marine coverage. In her free time, Monica enjoys traveling, boating, cooking and reading, and is an expert decorator.