Team Bios

Bill Caesar

Chief Executive Officer

  • William “Bill” Caesar is the Chief Executive Officer for WCA and has over fifteen years experience executing operational and strategic performance in multiple industries.
  • Bill joined WCA after serving as President of WM Recycling and the WM Organic Growth Group, where he developed the industry-leading recyclable materials business for Waste Management and led its strategic technology and services investments. 
  • Prior to holding those positions, Bill served as Chief Strategy Officer for Waste Management.  
  • Bill was a principal in the Atlanta Office of McKinsey & Company, the world’s leading management consulting firm. During his 13-year tenure at McKinsey, Bill advised clients across a broad spectrum of industries, including waste management, on corporate strategy, growth initiatives, performance improvement and sales strategies.
  • Bill holds a bachelor of arts degree from Colgate University, a masters’ degree from Georgetown University, and an MBA from the Fuqua School of Business at Duke University, where he was awarded a Keller Scholar Fellowship and graduated as a Fuqua Scholar.

Dianna Cervantes

Chief Financial Officer

  • Dianna Cervantes is the Chief Financial Officer for WCA and provides leadership for the accounting, financial planning, treasury and risk management operations of our company.
  • Dianna has more than 16 years of financial leadership experience, including over ten years in the waste industry, where she has served as a business partner to operational leaders and led teams responsible for accounting, budgeting, financial reporting, performance analysis, and capital investment management.
  • Prior to joining WCA, Dianna served as Vice President and Chief Accounting Officer with Rockwater Energy Solutions in Houston, Texas, where she led more than 40 accountants, managed the external audit and proved to be a leader who was skilled at identifying and executing upon SG&A cost reduction opportunities.
  • She is a Certified Public Accountant, and holds a Bachelor’s degree in Business Administration from the University of Hawaii.

Michael Roy

Senior Vice President and General Counsel

  • Mike is the Senior Vice President – General Counsel of WCA, a position he has held since joining WCA in December 2007. In such capacity, he has primary responsibility over all of WCA legal affairs and leads the Human Resources/Benefits/Risk Management department.
  • Mike also serves as Secretary of WCA and Vice President and Secretary of WCA’s subsidiaries.
  • Mike was formerly Senior Vice President, General Counsel and Secretary of Sterling Bank and Charter Bank, Houston-based public bank holding companies.
  • Mike was a corporate securities and M&A attorney with two Houston law firms prior to joining Charter Bank, at which time he was the youngest General Counsel of a public financial services company.
  • In his 15 plus years as general counsel of three public companies, Mike has handled over 40 acquisitions, 10 capital financings and a myriad of other transactional matters.
  • Mike also was the founder and CEO of Independence Bank, N.A., a start-up Houston community bank.
  • Mike received his Doctorate of Jurisprudence from the University of Houston Law Center and holds a Bachelor of Arts from Northwestern University.

Kevin O'Brien

Vice President - Region 1

  • Kevin is Regional Vice President of WCA Waste Corporation’s Missouri, Kansas, Colorado, and New Mexico Region and brings over 25 years of solid waste industry experience.
  • Kevin’s experience in the waste industry began with various positions at Waste Management including landfill manager and market area manager.
  • Kevin completed the Missouri Department of Natural Resource’s Solid Waste Certification course and has extensive knowledge and experience in design, permitting, constructing and operating solid waste disposal and gas-to-energy facilities.
  • Kevin currently serves as Chair for the Missouri NSWMA Chapter and has been involved in several local community projects including waste planning, waste reduction and education programs.

Matt Graham

Vice President - Region 2

  • Matt is the Vice President of WCA Waste Corporation's Texas Region and has over 21 years of experience in the solid waste management industry.
  • Matt joined WCA in 2000 as Regional Controller and from 2004 until the purchase by Macquarie Infrastructure Partners II in 2012 served as Integration Controller.  In 2013, Matt transitioned  into an operational role for WCA to handle its growth mode.
  • During his tenure at WCA, Matt has worked on financial and operational integration on over 40 acquisition transactions.
  • Prior to joining WCA, Matt served in various controllership roles in the solid waste management industry in Texas, Alabama, Arkansas, Florida, Georgia, and Louisiana.
  • Matt holds a Bachelor of Business Administration degree in Accounting from the University of Houston-Downtown and a Bachelor of Science in Law Enforcement/Police Science from Sam Houston State University.

Bob Shires

Vice President - Region 3

  • Bob is Regional Vice President of WCA Waste Corporation’s Florida, Alabama, Arkansas, Oklahoma, and Tennessee Region with over 10 years in the solid waste industry.
  • Prior to joining WCA, Bob served as Regional Vice President of Emerald Waste Services and as Area Manager for Waste Management.
  • Before starting his career in the solid waste industry, Bob brought 16 years of experience with FedEx, holding a variety of positions in logistics, customer service and operations.
  • Bob attended the University of Utah and the College of Great Falls with a focus on Business Administration.

Matt Spencer

Vice President - Operations

  • Matt has over ten years experience in the solid waste management industry where he has successfully implemented and supervised performance programs for employees to deliver outstanding operations and customer service.
  • Prior to joining WCA, he served as General Manager of Landfill and Hauling Operations for Republic Services, where he was responsible for profit and loss as well as all departments within the business unit. 
  • He has served in multiple roles for Waste Management, including Senior District Manager, Area Safety Manager, and Route Manager.
  • Matt holds a Bachelor’s Degree in Journalism and Mass Communication from the University of South Carolina.

Michael Schmidt

Vice President – Business Development

  • Michael Schmidt serves as WCA’s Vice President of Business Development.  Prior to joining WCA, Michael spent the last 14 years at Comerica Bank in Detroit, Michigan where, he built a career by expanding his business and strategic thinking skills through positions that included client relationship manager and senior credit officer, and was instrumental in the formation of Comerica’s Environmental Service Department.
  • During his tenure in the environmental services space, Michael worked with numerous clients and applied an advisory-based approach to customer relationships, while underwriting and consulting on more than 100 acquisitions, including tuck-ins by strategic waste companies, as well as large platform acquisitions by private equity firms.
  • As a senior credit officer, Michael put his underwriting and acute business acumen skills to work, analyzing the financial performance and credit worthiness of environmental and middle market clientele for Comerica.
  • Michael holds a Bachelor of Business Administration and a Master of Business Administration from the University of Michigan-Dearborn, with a major in Finance.  He is also a Certified Financial Risk Manager.

Robert Bartee

Vice President - Environmental Health and Safety

  • Robert Bartee is the Vice President of Environmental Health and Safety. He joined WCA in October of 2001 as the Director of Safety.
  • Robert also held various Environmental, Safety, and Health positions with Browning-Ferris Industries in Texas and Louisiana.  
  • From October of 1999 until September 2001, he was the Division Safety Manager for Waste Management in Fort Worth, TX.
  • Robert is a Certified Safety Professional and received a Bachelor of Science degree in Occupational Safety and Health from Southeastern Oklahoma State University.
  • He has over 18 years of experience in the solid waste management industry.

Antonio Marin

Vice President – Information Systems

  • Antonio Marin is the Vice President of Information Systems.
  • His career spans more than 20 years in IT with experience in strategic planning, business alignment, mergers and acquisitions, operations excellence, software development and project management.
  • Prior to joining WCA, Antonio held several C-level leadership roles in a variety of industries including oil & gas, retail energy, logistics, commercial software, and engineering procurement construction companies.
  • He has extensive experience managing global teams, including overseas assignments in Chile and Brazil.
  • Antonio holds a Bachelor of Science degree in computer science, an MBA in Global Management and is a certified project management professional.

Carrie Miller

Vice President - Human Resources

  • Carrie Miller is the Vice President - Human Resources for WCA and provides leadership to WCA’s commitment to delivering innovative benefits, opportunities, and solutions to our valued employees.
  • Carrie has over 15 years of HR management expertise including strategic planning, talent attraction and retention, training and development, policy administration, legal compliance, and employee relations.
  • Prior to joining WCA, Carrie served as the Senior Director of Human Resources for Key Energy Services in Houston, Texas, where she directed duties for more than 20 HR Directors, Managers, Recruiters, and support staff. 
  • Carrie served as the Human Resource lead for three acquisitions.
  • She holds a Bachelor's degree in Human Services and Psychology from Alaska Pacific University.

Jeannette Clark

Vice President – Finance

  • Jeannette Clark is the Vice President of Finance for WCA, and brings 30 years of finance and accounting experience to us.
  • Prior to joining our team, Jeannette was the Controller of the Americas Region at Intertek, a global group of testing laboratories for textile, footwear, toy, petroleum, and chemical industries.
  • She also brings expertise in auditing, repatriated general ledger activities, profit sharing conversion, divestiture, tax solution, and cash flow modeling and management.
  • Jeannette has more than seven years of waste industry knowledge, having worked with PSC, where she served as the Director of Finance & Accounting.
  • She is a Certified Public Accountant, and holds a Bachelor’s degree from the University of Houston.