Leadership Team


Robert Rasmus, Chief Executive Officer

Mr. Robert Rasmus has numerous years of experience leading organizational strategy, investments, and mergers and acquisitions in multiple industries, including as Co-founder, Chairman, CEO and former member of the Board of Directors of Hi-Crush Proppants, Hi-Crush GP, National Industrial Sands Association, FB Logistics, NextStage Logistics. Currently, Robert is a member of the Board of Directors of Carestream Health, Arctic Canadian Diamond Company, Eastern Shelf Royalty Fund III, Headwater Minerals II, Wilson Sheehan Lab for Economic Opportunity, Proppant Holdings LLC, and the University of Notre Dame Arts & Letters Council. Robert was a Co-founder and Managing Partner of Red Oak Capital Management and Chief Operating Officer at Red Oak Energy Operating Company prior to his time at Hi-Crush. Prior to Red Oak, Robert spent time leading organizations at Thunderbolt Capital Corp, Banc One Capital Markets (formerly First Chicago Capital Markets and now part of JP Morgan), and First Chicago Limited in London. Robert has a Bachelor of Arts in Government and International Relations from the University of Notre Dame.


Garrett Chandler, Vice President of Sales

Garrett Chandler joined ADA Carbon Solutions in 2016 and currently serves as Vice President of Sales. Throughout his time at ADA, he has assumed roles of increasing scope and responsibility within the sales team.

Before joining ADA, Garrett worked for Occidental Chemical Corporation (NYSE: OXY), where he adeptly managed commercial efforts across diverse markets including oil and gas, pharmaceuticals, steel, specialty chemicals, plastics, and pulp & paper.

Garrett has a B.A. in Business Marketing and Sales from Michigan State University.


Dr. Paul Groves, New Products Commercialization

Paul joined Arq Limited in 2015 and currently serves as the head of New Products Commercialization. Paul has more than 30 years of experience in the Energy and Resources markets. While at Arq, Paul served in a variety of capacities, most notably as the company’s COO. Prior to joining Arq, Paul served as Managing Director for Petrofac, a leading international service provider to the energy industry, as well as in senior roles with BG Group, Shell and Alcan.


Kimberly Hansen, Vice President of Finance

Kimberly joined ADES in 2022 and currently serves as the Vice President of Finance. Kimberly has more than 20 years of finance and accounting experience. Prior to ADES, Kimberly served as the Vice President of FP&A at Air Methods and various finance positions at ClearChoice Dental and First Data. Kimberly received her BAc in Accounting at the University of Minnesota, Duluth and earned her MBA, Accounting and Finance, from Regis University.


Stacia Hansen

Stacia Hansen joined ADES in 2015 and currently serves as the Chief Accounting Officer. Throughout her time at ADES, Stacia has served in roles of increasing responsibility including Director of Financial Reporting and Manager of Financial Reporting. Stacia has more than 12 years accounting experience and expertise in financial reporting, technical accounting, Sarbanes-Oxley Act compliance. Prior to ADES, Stacia worked in Assurance Services, at Ernst & Young, LLP. Stacia is a certified public accountant and graduated with a B.S. and a Master of Accountancy from the University of Denver.


Lorraine Lang, Vice President of HR

Lorraine Lang joined ADA Carbon Solutions and currently serves as the Vice President of Human Resources. Lorraine has ~15 years’ Human Resources leadership experience in the Specialty Chemicals Industry.

Prior to joining ADA Carbon Solutions, Lorraine was the Human Resources Manager for Sun Chemical Shared Services. Lorraine has a Bachelor of Arts degree from Bowling Green State University and a Master’s degree in Business Administration from Thomas More College. Lorraine is certified by the Society of Human Resource Management (SHRM) as both a Senior Professional of Human Resources as well as a SHRM Senior Certified Professional.


Clay Smith, General Counsel & Secretary

Clay Smith joined ADA Carbon Solutions in 2014 and currently serves as Interim General Counsel & Secretary. Throughout his tenure at ADES, he’s assumed roles of increasing scope and responsibility, most recently serving as Assistant General Counsel.

Prior to joining ADA, Clay was an Associate at Troutman Sanders, LLP for 6 years where his practice was focused on the infrastructure, telecom, and construction industries.

Clay has a B.A. in History from Colby College and a J.D. in Law from Tulane University.


Jeremy “Deke” Williamson, Chief Operating Officer

Deke Williamson joined ADES in 2023 and currently serves as the Chief Operating Officer. Deke has more than 20 years of industrial manufacturing experience. Prior to joining ADES, Deke held various positions at Hi-Crush, Inc. and was previously the plant manager at Southeast Missouri Stone.

Deke holds both an MBA and a Bachelor of Science degree in Business Management from the University of Phoenix.


Joe Wong, Chief Technology Officer

Joe serves as Chief Technology Officer and has over 35 years of industry leadership experience in Research & Development, product development and business growth in specialty materials. Prior to joining Advanced Emissions Solutions in 2018, Joe served as the Chief Technology Officer for ADA Carbon Solutions since 2011. 

Before ADA Carbon Solutions, Joe worked three years in private consulting, and spent 21 years with MeadWestvaco Corporation in senior leadership positions for the Specialty Chemicals and Research & Development sectors. 

Joe holds a PhD. in Chemical Engineering from the University of Texas.