Our Team

A-Tech has the best team in the business! Our Executive Leadership, Project Management, Field Staff and Reports Specialists are all experts at their respective crafts and are ready and willing to go the extra mile for every one of our clients.

Casandra Williams, 


Casandra Williams, co-founded A-Tech Consulting, Inc. in 2002, as the Chief Financial Officer and business development administrator.  Mrs. Williams has managed thousands of projects including HUD level inspections, airport soundproofing inspections, AHERA school reinspections, volatile organic compound testing, carbon monoxide mitigation, radon testing, construction safety and health management, hospital related infection control in construction management, confined space permitting, water loss restoration monitoring and fire burn-out restoration management.


Robert Williams,  CAC, CDPH, CIEC

President, Founder

Robert Williams has been in the environmental industry since 1988. He is a Certified Asbestos Consultant, Department of Public Health Inspector Assessor and Project Monitor. Mr. Williams began his career working for a national environmental firm as a CAD drafter and technical writer. This position later evolved into environmental consulting through ongoing training within the company. During the 14 year tenure with his former company, his position progressed from intern to Senior Vice President. In 2002, Robert Williams co-founded A-Tech Consulting, Inc. with the goal of combining his expertise with quality service.


Conan Williams,  CAC, CDPH, CIEC

Vice President

Conan Williams has been in the environmental industry and a member of the A-Tech Team since 2006. Mr. Williams’ professional development in his career has promoted him to Vice President at A-Tech Consulting. Conan handles ongoing project coordination, new project scope development and is integral in cultivating existing client relationships. Additionally, Mr. Williams has extensive experience in managing large scale environmental projects including; contamination assessments, microbial assessments, HAZMAT assessments, abatement and mitigation projects in the public and private sectors.


Joseph Williams,  CAC, CDPH,
Radon RMP

Director of Business Operations

Joseph Williams has been in the environmental industry since 2008. He is a certified asbestos consultant and California Department of Public Health Inspector/Assessor and Project Monitor. Mr. Williams specializes in inspections, project oversight and clearance inspections. Joe has a strong background in HUD, EPA and OSHA requirements. Having personally handled hundreds of HUD level lead inspections, lead risk assessments and supervising many lead hazard mitigation projects, Mr. Williams is highly trained and experienced lead inspector and project monitor.


Marty Kimble,  CAC, CDPH

General Manager

Mr. Kimble has 21 years of experience in management of staff, departments and divisions as well as client relations and project manager-level employees. Overall, he has 26 years of management experience with site assessments including major property redevelopment projects for contaminated properties, mold and bacteria investigations and asbestos, mold and lead consulting for planned demolition/renovation projects. Martin has a strong history of client relations with a strong background in the insurance sector.


Bernadette Guerrero

Director of Infrastructure

Bernadette Guerrero has been an Accounting Manager and Full-Charge Bookkeeper for over 15 years, and has gained expertise in multiple industries, including retail, entertainment, manufacturing, and information technology. From 2008-2010, Bernadette served as A-Tech Consulting’s Accounting Manager, specializing in daily accounting, environmental reporting, technical writing, and Bid/RFP production. She also deployed a Microsoft SharePoint site for one of A-Tech’s most prominent clients. Since her return to A-Tech, Bernadette has taken on special technical projects to help propel A-Tech Consulting into the future. 


Jamie Kelley

Office & Operations Manager

Jamie Kelley has over 12 years of experience working an office administration role and has worn many hats, including marketing, customer service, content curator, consumer relationship management, operations coordinator and more. Prior to joining the A-Tech team, Jamie worked as the Operations Manager for one of the fastest-growing tech startups in San Diego. Since joining A-Tech, Jamie has utilized her organizational skills in managing the office report team and streamlining processes and procedures. 


David Kang,  CIH, LEED, MPH

Environmental Health & Safety Specialist

David Kang is a Certified Industrial Hygienist (CIH) with over 19 years of experience in the environmental, health and safety fields. David entered the EH&S profession as an industrial hygienist/safety engineer with Cal OSHA shortly after earning his MPH from UC Berkeley. Working for a regulatory agency enabled him to gain an excellent foundation and understanding in federal, state, and local regulations. He has developed, implemented, and managed a variety of environmental health and safety programs such as chemical safety, industrial hygiene monitoring, indoor air quality surveys, respiratory protection, ventilation assessments, confined space, noise surveys, contractor safety, hazardous waste management, and employee safety training.


Roosevelt Ward,  CIH, CSP, QISP

Senior Industrial Hygienist

Mr. Roosevelt Ward is an ABIH Certified Industrial Hygienist (CIH), BCSP Certified Safety Profesional (CSP) and a California Qualified INdustrial Storm Water Practitioner (QISP) with over 15 years of experience in the environmental, health and safety field.  Mr. Ward started his career as an industrial hygienist consultant and has been focused on anticipating, recognizing, evaluating and controlling risks throughout various industries; specifically chemicals, aerospace and alloys manufacturing, with an emphasis on eliminating injuries, preventing toxic emissions and ensuring regulatory compliance.


Joshua LaPrease,  CAC, CDPH,
Radon RMP

Project Manager

Joshua LaPrease is a Certified Asbestos Consultant and CDPH Lead Inspector/Assessor. Mr. LaPrease specializes in project monitoring for asbestos abatement in any setting from residential to public schools to hospitals. He is also highly trained and experienced in infectious control for many hospitals we consult with. Mr. LaPrease and his careful attention to detail have also produced thorough and comprehensive mold/moisture intrusion assessments. Joshua holds a reputation of professionalism that our clients greatly respect.


Jimmy Rodewald, CAC, CDPH

Project Manager

Jimmy Rodewald is a Certified Asbestos Consultant and CDPH Lead Inspector/Assessor experienced in asbestos surveys and lead-paint sampling. He has over six years of environmental field and project management experience with abatement contractors, engineering firms, hospital/medical centers, commercial, and property management firms for high-density housing. He continues to increase his knowledge of mold and bacterial assessments with continuing education and practical field experience.