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President, Petrographer, Materials Scientist, Professional Geologist

For more than two decades, Dipayan Jana, the founder and CEO of CMC has been actively involved in characterization, testing, evaluation, and forensic investigation of a wide range of materials, including their short and long-term performance. Dipayan has worked on more than three-thousand projects on quality assurance, characterization, and forensic investigations of various kinds of geological, building, and construction materials e.g., terrestrial and extra-terrestrial rocks, minerals, gemstones, ceramics, building stones, lime, gypsum, hydraulic cements, natural and manufactured aggregates, concretes, and masonries from modern to historic structures. Dipayan has an extensive list of publications on applications of petrography and associated techniques in a wide variety of geological and construction materials that can be viewed under the 'publications' page.

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American Society for Testing and Materials (ASTM)

American Concrete Institute (ACI)

American Society of Civil Engineers (ASCE)

International Concrete Repair Institute (ICRI)

American Ceramic Society (ACE)

Society of Concrete Petrographers (SCP)

Geological Society of America (GSA)

Geochemical Society of America

Mineralogical Society of America (MSA)

American Geophysical Union (AGU)



Professional Geologist, Washington & Texas.

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Office Manager

In the position of Office Manager for almost two decades, Jennifer has been the nucleus of CMC's day-to-day operations. She is not only responsible for keeping track of clients’ needs, but also handles inventory tracking, maintenance of office equipment and computers, preparation of cost proposal and project entry in database, data compilations for Dipayan’s professional reports, and sample disposal/return arrangements after projects. As a right hand of Dipayan, Jennifer leaves him to do what he likes to do the most – spend time in his labs doing testing, examinations, report preparations, and consultations with clients.

Jennifer Hall


Lab Technician

Quite possibly the world's best thin section maker who has been meticulously preparing thin sections of anything and everything for almost two decades! Mr. Brown has a Bachelor of Science degree in Earth Science and Geography with concentrations in Geology, Cartography, and Mathematics. Jeff is involved in extensive sample preparation for CMC and its sister-company, Applied Petrographic Services, Inc. (, APS).  From regular day-to-day operations of sectioning, grinding, polishing, thin sectioning, and other sample preparation methods Jeff is also engaged in the research and development of innovative sample preparation fixtures and techniques for automated precision sectioning and grinding of multiple samples for the bulk production of quality thin sections for the customers of APS.




After finishing his BS and MS in Geological Sciences from Indian Institute of Science Education and Research at Kolkata, India, and a second MS in Geological Engineering from Michigan Technological University in Houghton, Michigan, Shubham has joined our team to pursue his career in concrete petrography. Shubham is involved in day-to-day operations from sample preparation to optical microscopy, chemical analysis, XRD, XRF, FTIR and other techniques. An avid hiker, Shubham enjoys his weekends in the trails of Allegheny mountains to fulfill his crave for field geology.        

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U.S. Army Corps. Of Engineers

Comment on Dipayan’s article “Delamination – A state-of-the-art review." Click on the following comment to read handwritten 4-page comments of this 'concrete giant' in 2002, at the age of 92, the same year that Bryant passed away.


“This is an exhaustive study. I was glad to get to read this. I learned a lot.”

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Materials and Petrography 

Comment on Dipayan’s article “Troubleshooting Concrete Problems Through Microscopy” 1997


“It is very well written, yet succinct, and provides a good perspective of the application of microscopy in the concrete industry. I am left with little upon which to comment as a basis for improvement.”

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Principal Petrographer at Campbell Petrographics, one of the world’s leading authorities on cement and concrete microscopy, and author of the well-known book “Microscopical Examinations and Interpretation of Portland Cement and Clinker.”

“Dipayan Jana is undoubtedly one of the best petrographers around. One of his strongest talents is utilizing the blend of light- and electron-microscopy in diagnosing concrete and mortar failures. Furthermore, he can write quite well, having made many excellent contributions to our professional journals. I highly recommend Dipayan.”

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President, Edison Coatings, Inc. Plainville, Connecticut 

“CMC employs an impressive array of technological tools to provide comprehensive analyses for historic masonry mortars. They also deliver results on a reliable schedule to meet the time pressure of our clients’ projects.”

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Principal/Structural Division Manager, Woodstock, Maryland

"I have utilized Dr. Jana’s and CMC’s services exclusively for over seventeen years.  I find their reports to be thorough, conclusive and always delivered in a timely fashion (usually sooner than promised)."

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Sr. Architectural Conservator, Arlington, Virginia

"CMC, Inc. is an excellent resource for petrographic analysis of historic mortars.  Mortar analysis for historic buildings must go beyond just understanding the components of the mortar to understanding how those components are contributing to the success or failure of that mortar over time.  This is where CMC, Inc. succeeds in guiding architects towards the right restoration mortar mix.  The reports are thorough yet concise with reliable turn-around times.  Dr. Jana is always willing to discuss the findings and his clients can count on his expertise."

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Structural Engineer, Phoenix, Arizona

"I have worked with CMC for well over 10 years with petrographic analysis. They have consistently dug deeper, using SEM or other methodology to better understand the real cause of the problem. Their reports and photographs are excellent, and they explain what their findings mean, not just what they saw."



Delta Testing Labs, New York

"I highly recommend working with CMC for their exceptional professionalism, attention to detail, and timely reports. From the moment we began working with them over 15 years ago they demonstrated a deep understanding of our needs and provided a work that exceeded our expectations.


Throughout our working partnership, they have consistently delivered high-quality work and demonstrated a strong commitment to meeting our project timelines. Their communication skills are second to none, and they always keep us informed with detailed reports.


Furthermore, CMC is a pleasure to work with, always taking the time to listen to our concerns and offering proactive solutions to help us achieve our goals. We appreciate their willingness to go above and beyond to ensure our success, and we look forward to continuing our partnership with them for years to come.


Overall, I highly recommend CMC to anyone looking for a reliable, professional, and results-driven partner to help them achieve their project goals."

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PEDRO FEBO BORIA, Vice President
SPEC Group, San Juan, Puerto Rico


"CMC is an excellent resource for petrographic analysis. I have worked with CMC for the last 8 to 10 years with petrographic analysis. The services provided are returned in an on time manner. Their reports are excellent, easy to understand and very complete. I highly recommend CMC to anyone looking for a professional and complete petrographic analysis."



"Craig Testing Laboratories of Maryland, Inc. has had a professional relationship with CMC and Dipayan for over 20+ years. From our initial project, Dipayan and his staff have handled numerous projects involving various types of analysis and investigation.

The reports are completed quickly and thoroughly.  The reports supply our client's with the requested information.  Additionally, Dipayan is always available for consultation to walk the client through his findings.

CMC is an excellent resource to have on your team and we are thankful he is part of ours.  Their knowledge, turnaround time, cost, and reporting would be an asset to any project."



Architectural Conservator,

"We discovered CMC during our search for partner laboratories who could help us with client requests for instrumental mortar analyses. CMC was one of the few firms willing to take on smaller, less prestigious projects, while still providing timely and thorough results. I have found the firm to be knowledgeable, prompt, and responsive to all project inquiries and questions.  CMC's fees are also very reasonable. It has been a pleasure to work with CMC, and I would certainly recommend someone looking for similar services reach out to them."



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