Dr. Chahid K. Ghaddar is the Inventor of ExceLab Calculus Add-In, and the Founder of ExcelWorks LLC. He holds M.S. and Ph.D. from Massachusetts Institute of Technology, with a background in parallel computational methods, algorithms and software engineering. During his twenty-year industrial career, Dr. Ghaddar has led numerous software development projects for diverse applications including Mathematical Modeling Tools, Computer Vision, Simulations, MEMS, CAD, and Finance applications. He contributed to leading engineering programs including CoventorWare and popular Mathcad which he supported and advanced its numerical capabilities for almost 10 years. He has also developed software for mission critical applications including lithography process control, and real time industrial machine vision inspections systems currently in production.

Dr. Ghaddar's long career in computational Mathematics on top of substantial experience with Microsoft Windows Development have inspired him to develop a new functional approach to mathematical modeling and optimization with a clear objective: to make computing simple, intuitive and readily accessible for all. Excel with its ubiquity and versatility, presented itself as the ideal vehicle for this ambitious goal, and ExceLab was born as a unique calculus Add-in to Excel. ExceLab is based on a Patented Technology that represents a breakthrough in the utilization of the spreadsheet application. ExceLab functions have no parallels in the history of the spreadsheet application since its inception in the seventies.


  • Ghaddar, C. K. (2020), "Method, Apparatus, and Computer Program Product for Solving Single and Multiple Integral Equations Using Spreadsheet Software". USA Patent No. 10628634.

  • Ghaddar, C. K. (2018), "Method, Apparatus, and Computer Program Product for Solving Equation System Models Using Spreadsheet Software". USA Patent No. 9892108.

  • Ghaddar, C. K. (2018), "Method, Apparatus, and Computer Program Product for Solving an Equation System Using Pure Spreadsheet Functions". USA Patent No. 10114812.

  • Ghaddar, C. K. (2016), "Method, Apparatus, and Computer Program Product for Optimizing Parameterized Models Using Functional Paradigm of Spreadsheet Software". USA Patent No. 9286286.


  • Ghaddar, C.K. "Rapid Solution of Optimal Control Problems by a Functional Spreadsheet Paradigm: A Practical Method for the Non-Programmer". Math. Comput. Appl. 2018, 23, 54.
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  • Ghaddar, C.K. "Rapid Modeling and Parameter Estimation of Partial Differential Algebraic Equations by a Functional Spreadsheet Paradigm". Math. Comput. Appl. 2018, 23, 39.
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  • Ghaddar, C. K. "ExceLab: Transforming Excel Spreadsheet into a Powerhouse for Calculus and Dynamical Optimization". SIAM Annual Meeting July 9 - 13, 2018, Oregon Convention Center, Portland, Oregon, USA
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  • Ghaddar, C. K. "Novel Spreadsheet Direct Method for Optimal Control Problems." Math. Comput. Appl., 23, 6, 2018.
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  • Ghaddar, C. K. "Unlocking the Spreadsheet Utility for Calculus: A Pure Worksheet Solver for Differential Equations", Spreadsheets in Education (eJSiE): Vol. 9: Iss. 1, Article 5. 2016.
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  • Ghaddar, C. K. "Modeling and Optimization of Dynamical Systems by Unconventional Spreadsheet Functions", American Journal of Modeling and Optimization. Vol. 4, No. 1, 2016
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  • Ghaddar, C. K. "Unconventional Calculus Spreadsheet Functions ". World Academy of Science, Engineering and Technology, International Science Index 112, International Journal of Mathematical, Computational, Physical, Electrical and Computer Engineering, 10(4), 160 - 166, 2016
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  • C. Ghaddar and Kaan Karamete, "A MEMS-Tailored All-Hex Meshing Procedure". 8th International Conference on Numerical Grid Generation in Computational Field Simulations. Honolulu, Hawaii June 3-6, 2002

  • Y. Yang, M Kamon, V. Rabinovich, C. Ghaddar, M. Deshpande, K. Greiner and J. Gilbert: "Modeling Gas Damping and spring phenomena in mems with frequency dependent macro models". The 14th IEEE International Conference on Micro Electro Mechanical Systems, Interlaken, switzerland, January 21-25, 2001, pp.365

  • C. Ghaddar and J. Gilbert, "On the modeling of the Wheatstone-Bridge Piezoresistive Pressure Sensor: A finite-Element-Based Approach". ASME International Mechanical Engineering congress and exposition (MEMS). Nashville, Tennesse. November 14-19, 1999

  • C. Ghaddar, J.van Kuijic, J. Gilbert, W. Cowan, and J. Butler, "Simulation and Design of Electro-Thermally Actuated MEMS Devices: A case study: the AFIT piston Micromirror". ASME International Mechanical Engineering congress and exposition (MEMS). Anaheim, California. November 15-20, 1998, pp.293

  • C. Ghaddar M. Da Silva, J. Gilbert and S. Bart, "Numerical Simulations and Design of the Four-Terminal Piezoresistive Pressure Transducer". ASME International Mechanical Engineering congress and exposition (MEMS). Anaheim, California. November 15-20, 1998, pp.329

  • M. Zaman, I. Tchertkov, C. Ghaddar, S. Bart, and J. Gilbert, "A technique for extraction of macro models in system level simulation of inertial electro-mechanical micro systems". The Second International Conference on Modeling and Simulation of Microsystems, San Juan, Puerto Rico April 19-21, 1999, pp. 163-167

  • M. Deshpande, C. Ghaddar, J. Gilbert, P. St John, T. Woudenbert, C. Connell, J. Molho, A. Herr, G. Mungal and T. Kenny, "Numerical Framework for the Modeling of Electrokinetic Flows". SPIE, Santa Clara, California, September 20-22, 1998

  • C. Ghaddar and S. Motakef, "ABAQUS-Compatible Fluid Dynamics Computational Tool". In the Proceedings of the ABAQUS USERS' CONFERENCE, May 29-31 1996. Newport, Rhode Island

  • C. Ghaddar, C. Lee, S. Motakef, D. Gillies, "Numerical simulation of THM growth of CdTe in presence of rotating magnetic fields (RMF)". Journal of Crystal Growth 205 (1999) 97-111

  • C. Ghaddar, "On the Permeability of Unidirectional Fibrou Media: a Parallel Computational Approach". Physics of Fluids, 7(11), pp 2563, Nov. 1995

  • C. Ghaddar, Y. Maday and A.T. Patera, "Analysis of a Part Design Procedure". Numerische Mathematik, 71(4), pp 465. 1995

  • M. Cruz, C. Ghaddar and A.T. Patera, "A Variational—Bound Nip--Element Method for Geometrically Stiff Problems; Applications to Thermal Composites and Porous Media." Proceedings of the Royal Society of London, Series A, 449, pp 93-122. 1995

  • S. Yesilyurt, C. Ghaddar, M. Cruz and A.T. Patera, "Bayesian-Validated Surrogates for Noisy Computer Simulations". SIAM Journal of Scientific Computing, 17(4). July 1996

  • M. Cruz, C. Ghaddar and A.T. Patera, "Parallel Simulation of Multicomponent Random Media". In the Proceedings of the ASME International Symposium on Parallel Computing in Multiphase Flow Systems Simulations, November 1994, Chicago



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ExceLab: Transforming Excel into a Calculus Power House

ExceLab functions and methods are protected by USA Patents 10628634, 10114812, 9892108 and 9286286.

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