Dr. Chahid K. Ghaddar is the inventor of the ExceLab Calculus Add-in and the founder of ExcelWorks LLC. He holds M.S. and Ph.D. degrees from the Massachusetts Institute of Technology (MIT), with a background in parallel computational methods, algorithms, and software engineering.
Over an industrial career spanning three decades, Dr. Ghaddar has led major software development projects across diverse fields, including mathematical modeling, computer vision, simulation, MEMS, CAD, 3D Printing, and finance. He has contributed to leading engineering platforms including Mathcad, where he spent nearly a decade advancing its numerical and computational capabilities. His work also includes mission-critical systems for lithography process control and real-time machine-vision inspection, currently deployed in industrial production.
Drawing on his deep expertise in computational mathematics and Windows software development, Dr. Ghaddar pioneered a new functional approach to mathematical modeling and optimization with a clear vision: to make advanced computing simple, intuitive, and universally accessible. Recognizing Excel’s ubiquity and versatility, he identified it as the ideal platform for this mission — and ExceLab was born as a groundbreaking calculus add-in powered by patented technology.
ExceLab represents a breakthrough in the evolution of spreadsheet computing — extending Excel beyond its traditional limits to perform true mathematical modeling, integration, differentiation, and equation solving directly within cells. Since the spreadsheet’s invention in the 1970s, no comparable innovation has so profoundly expanded its computational reach.
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.
Available at: https://www.mdpi.com/2297-8747/23/4/54
Ghaddar, C.K. "Rapid Modeling and Parameter Estimation of Partial Differential Algebraic Equations by a Functional Spreadsheet Paradigm". Math. Comput. Appl. 2018, 23, 39.
Available at: http://www.mdpi.com/2297-8747/23/3/39
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
Available at: http://meetings.siam.org/sess/dsp_talk.cfm?p=92280
Ghaddar, C. K. "Novel Spreadsheet Direct Method for Optimal Control Problems." Math. Comput. Appl., 23, 6, 2018.
Available at: http://www.mdpi.com/2297-8747/23/1/6
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.
Available at: http://epublications.bond.edu.au/ejsie/vol9/iss1/5
Ghaddar, C. K. "Modeling and Optimization of Dynamical Systems by Unconventional Spreadsheet
Functions", American Journal of Modeling and Optimization. Vol. 4, No. 1, 2016
Available at: http://pubs.sciepub.com/ajmo/4/1/1
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
Available at: http://waset.org/publications/10004374
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
