Best's Insurance Professional Resources

Your Online Portal for Claims Industry Information

Best's Insurance Professional Resources

Your Online Portal for Claims Industry Information

Best's Recommended Insurance Adjusters

f/k/a Nixon / Allmark

13545 Barrett Parkway Drive, Suite 350, St. Louis, Missouri 63021

Mailing Address: P.O. Box 220999, St. Louis, MO 63122

Established: 1976


  • Multi Lingual Services
  • Fire and Allied Lines
  • General Liability
  • Bodily Injury
  • Workers' Compensation
  • Business Interruption
  • Errors and Omissions
  • Professional Liability
  • Homeowners
  • Appraisals
  • Truck and Heavy Equipment Appraisals
  • Commercial Property
  • Buses
  • Dram Shop
  • Ocean Marine
  • Long Haul Trucking
  • Truck and Cargo
  • Burglary/Theft
  • Automobile (All Lines)
  • Inland Marine
  • Heavy Equipment Appraisals
  • Property Damage
  • Fidelity Bonds
  • Product Liability
  • Medical Malpractice
  • Owners, Landlords and Tenants
  • Motorcycles
  • Automobile Appraisals
  • Fire
  • All Livery Services
  • Flood
  • Liability
  • Aviation
  • Cargo
  • Mobile Homes
  • Medical Services

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About Us

From ClaimsPro's inception nearly 45 years ago as a small group of independent adjusters, to our status today as a multi-national independent adjusting firm, our actions have been motivated by a single question-how can we use our skills and knowledge to help our clients achieve their goals?

Our journey to answer this question has encouraged a continuous evolution of the ways in which we work, do business, and the services we provide. All this has been fuelled by continuous conversations with our clients, including years of listening, talking, working together through challenges, and sharing successes.

Motivated by the need to understand exactly where and how to improve our own services, we've developed powerful, proprietary claims management software, iAdjust™. This technology empowers us to measure and track not only our performance on a daily basis but also key claims data for our clients, helping them gain a better understanding of their exposures and implement proactive risk management strategies.

Today we leverage the unlimited reporting power of iAdjust™ to show our clients how and why our partnership brings value to their business. Above all else, our clients value our desire to help them succeed and our ability to demonstrate the tangible value of their partnership with us. As our clients' businesses and needs evolve, so too do the ways in which we provide them with the valuable tools, services, and knowledge they need.

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Additional Locations

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Professional Memberships

  • National Association of Independent Insurance Adjusters
  • Kansas Claims Association, Inc.
  • Illinois Association of Independent Insurance Adjusters
  • Greater St. Louis Claims Association
  • Honorable Order of the Blue Goose International
  • Registered Professional Adjusters
  • St. Louis Claims Managers Counsel

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Personnel Information

  • T. Mark Nixon, President
  • Greg Sorensen, Property Director
  • John Jennings, RPA, Senior Liability Manager

Video: Nixon Principal: Driverless Cars to Enhance Claims Processing

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Service Areas

Carbondale, Illinois, USA 104 miles

East St. Louis, Illinois, USA 3 miles

Granite City, Illinois, USA 9 miles

Cape Girardeau, Missouri, USA 114 miles

De Soto, Missouri, USA 40 miles

Flat River, Missouri, USA 62 miles

Jefferson City, Missouri, USA 133 miles

St. Peters, Missouri, USA 27 miles

Sullivan, Missouri, USA 53 miles

Washington, Missouri, USA 37 miles

Wentzville, Missouri, USA 30 miles

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Contact Our Team | About Best's Insurance Professional Resources