About Us Our Team

Management

Management team of entrepreneurial and industry veterans purpose-built to grow CLEAN AS NEW® into a world-class company.

Darrell Stang

Darrell Stang
Chief Executive Officer

  • President and CEO of Tech Sonic since January 2016
  • CEO of CLEAN AS NEW® since April 2018
  • 35-year veteran of the water and wastewater industry
  • Read More
Paul Jasinski

Paul Jasinski
Chief Financial Officer

  • Joined CLEAN AS NEW® in 2021
  • Extensive experience across Upstream and Downstream roles globally with Royal Dutch Shell including as the Chief Financial Officer of a major Refining JV
  • Read More
Byron Kieser

Byron Kieser
Chief Science Officer

  • Director of R&D for Tech Sonic since 2010
  • 30+ year career in academic research, teaching, chemical instrumentation business development, marketing, & ultrasonic technology development
  • Read More
Roberto Tomotaki

Roberto Tomotaki
Heat Transfer SME

  • Former ExxonMobil Technology Discipline Lead
  • 25 years of experience in heat exchanger design, innovation, optimization and troubleshooting
  • Read More

Advisory Board

Industry veterans purpose-built to support the growth of CLEAN AS NEW® into a world-class company.

Dan Coombs

Dan Coombs
Former Executive Vice President Global Manufacturing – Lyondellbasell

  • Responsible for the 61 refineries and petrochemical plants globally
  • Read More
Bob Kent

Bob Kent
Former VP of Refining – CITGO

  • Responsible for the 3 USA CITGO refineries, HSSE, Refinery Optimization
  • Read More
Jose Lima

Jose Lima
Former VP New Business Development and Ventures Chemicals – Shell

  • 27-year career at Shell including roles as VP, Gas Monetization and Wind Energy and President, Shell US Gas and Power
  • Read More
James Griffin

James Griffin
Former VP of Manufacturing – Mitsubishi Chemical

  • Past board chair of The East Harris County Manufacturing Association, an alliance of 132 refineries and petrochemical plants
Don Empfield

Don Empfield
Former General Manager – Sunoco Chemicals

  • Currently responsible for Maintenance Services and Turnarounds at Turn2
Brett Woltjen

Brett Woltjen
Retired VP of Manufacturing Excellence and Ventures – Shell

  • 35-year career at Shell spanning production, operations, and general manager roles at Shell plants
  • Read More

Operations

Our team of experienced operators will get your heat exchangers cleaned to Like New!

Greg Contis

Greg Contis
Operations Manager

  • Read More
  •  
Joe Florie

Joe Florie
Field Service Manager

  • Read More
  •  
Roxanne Shank

Roxanne Shank
Director, Field Services

  • Read More
  •  
Cassidy Townsend

Cassidy Townsend
Business Services Coordinator

  • Read More
  •