The following are among companies, organizations or other groups that have engaged Marple's Publisher Michael J. Parks as a speaker.

Many organizations grant continuing education credit for attending his speaking engagements.

• Alaska Cold Storage Employers.
• American Consulting Engineers Council
• Associated Builders & Contractors of Western Washington
• Associated Taxpayers of Idaho
• Association of Washington Business (AWB)
• Bellevue Chamber of Commerce
• Buck and Gordon LLC (law firm)
• Commercial Real Estate Women (CREW)
• Concrete Reinforcing Steel Institute
• Economic Development Council of Skagit County
• Frontier Bank
• Grays Harbor Economic Development Council
• House Committee on Economic Development, Agriculture and Trade, Washington State Legislature
• Institute of Real Estate Management
• Island County Economic Development Council
• Key Bank of Washington
• Lewis County Economic Development Council
• Mechanical Contractors of Western Washington
• Miller Nash law firm
• Mountain Pacific Bank, Everett
• National Association of Purchasing Managers
• National Electrical Contractors Association (NECA)
• Oregon Refuse and Recycling Association
• Pemco Mutual Insurance Company
• Risk Management Association (formerly Robert Morris Associates)
• Riverview Asset Management
• Roofing Contractors of Washington
• Rotary Club of Seattle
• Seattle City Council
• Seattle Economists Club
• Seattle-Northwest Securities Corp.
• Spokane Estate Planning Council
• Surety Association of Washington
• The Executive Network of Seattle (TENS)
• Thurston County Economic Development Council
• Turnaround Management Association
• Trammell Crow
• U.S. Bank of Washington
• United Employers Association
• Washington Association of Certified Public Accountants
• Washington Association of Landscape Professionals
• Washington Contract Loggers Association (WCLA)
• Washington Employers Association
• Washington Independent Community Bankers Association
• Washington Society of Certified Public Accountants WSCPA.
• Washington Trucking Associations
• Washington Trust Bank
• Wells Fargo Bank
• West Coast Lumber Inspection Bureau