SIS Leadership Team

Mark Kershteyn

Founding Partner

Mark has an extensive background in Enterprise Software Systems development and implementation. His 30+ years of experience range from an eight-year tenure in Fortune 500 companies such as GTE Cellular and EDS managing large-scale mainframe based implementation and software development projects, to implementations involving Microsoft Dynamics family of software solutions. As a Managing Partner for SIS, Mark provides strategic leadership for the Company overall. His technical background coupled with his industry knowledge and executive skills prepared him to be very effective at driving SIS’s success. Mark has a Bachelor of Science, Information & Computer Science degree from Georgia Institute of Technology.

Steven Mulka

Founding Partner

Steven Mulka is a seasoned professional with over 35 years of experience in delivering financial and operational software solutions to project and service-based companies. As a partner at SIS, LLC, Steven has played a pivotal role in designing and architecting the SIS Construct 365 Field Service and Project Management solutions. These innovative tools are tailored to meet the complex needs of the construction industry, enabling companies to streamline processes, enhance efficiency, and boost productivity.

Steven’s in-depth understanding of the construction sector has been key to driving technological advancements that significantly improve both operational and financial performance for construction firms. His expertise lies in optimizing the project and field service lifecycles, from sales through closeout, ensuring smooth and effective operations across the industry.

Currently, Steven is focused on integrating artificial intelligence into the SIS Construct series of solutions. His vision is to revolutionize how SIS’s customers interact with and utilize these tools, ultimately leading to greater software adoption and increased productivity across the board.

Ravi Kannan

Founding Partner

Ravi has over 40 years’ experience in Executive Management, Consulting, Large Scale Enterprise Systems Implementation, Systems Design and Systems Development. He is the Architect of core SIS Products C365 Project Cost Management, C365 Advanced Labor and C365 Field Operations and is currently responsible for Product Development. His experience has enabled SIS to add significant value in our offerings in the Construction Vertical. Ravi received his Bachelor of Science (Electrical Engineering) and Masters of Science (Industrial Management) from The Indian Institute of Technology, Madras, India.

Viktor Lesiv

Vice President Professional Services

Viktor is a global services delivery expert with over 17 years of Microsoft Dynamics 365 (AX) experience. He is responsible for the overall operations leadership and Dynamics 365 solution delivery across our organization. Viktor’s deep expertise is in leading operations and services to deliver successful and referenceable ERP and CRM customer implementations. He is instrumental in substantially growing ERP practices, expanding their services capabilities and standardizing methodology and tools for Services Delivery. Viktor is a graduate of Kyiv National University, Cybernetics Faculty. Master of Social Informatics.

Dr. JT Gorrell

Senior Director, Services

JT is a seasoned ERP implementation specialist, with over 25 years leading some of the largest ERP implementations around the world.  He shares his deep expertise in ERP implementation leadership in his book entitled Leading Microsoft Dynamics ERP Implementation Projects. JT received his Bachelor of Science (Business Management) and MBA from LeTourneau University, and his Doctorate of Business Administration (Project Management) from Liberty University.  His doctoral research project was entitled Factors Affecting Microsoft Dynamics ERP Implementation Project Success.

Tracy Bell

Senior Director, Client Success

Tracy has almost 20 years of construction industry expertise, with roles ranging from IT leadership of a top ENR construction company to executive leadership in professional services.  Experienced in IT strategy, software selection, implementation, and data services, Tracy’s passion for digital transformation through quality delivery brought her to SIS, where she guides service delivery to align with the business objectives of our enterprise construction clients.  Tracy is a member of the IRONPROS for Construction Editorial Advisory Board, serves on the AGC of MO ConTech Conference Advisory Committee, and was listed as one Constructech’s 2019 Women in Construction.  She holds a B.A. and M.A. in Counseling.

Katrina Kostes

Senior Director, Strategic Relationships

Katrina Kostes is seasoned executive with a solid career in Management Consulting spanning 30+ years. During that time, she has successfully guided organizations through strategic transformational initiatives. By applying her broad expertise, Katrina has facilitated fundamental change and delivered significant results aligned with strategic objectives. Katrina’s ability to connect with every level with an organization has gained her recognition and established a reputation of trusted advisor, agent of change and leader.

Gary Bonuso

Director, Industry Consulting

Gary is a Senior Financial professional with over 13 years of experience implementing and using Microsoft Dynamics AX/D365 in Construction/Manufacturing organizations. Gary brings 20 years of experience working for three different Top 10 ENR Specialty Contractors to SIS. His background in Finance as well as significant exposure to Operations, Project Controls, SCM and HR/Payroll give him a solid foundation of knowledge that our clients can leverage to insure successful implementation projects. He is a graduate of the University of Central Missouri with a BSBA Accounting Degree.

Joanne Choate

Principal Industry Consultant

Joanne Choate is a seasoned finance professional specializing in finance, cost, and project/internal controls with over 35 years of experience in both the public and private sectors for ENR’s top 20 general contractors and U.S. Fortune 50 service companies.  Joanne is experienced with multiple ERP systems and implementations from her time in business leadership as well as consulting.  Her background in operations and finance allows her to connect with our clients, building solid working relationships throughout the implementation process.  Joanne is a graduate of Babson College with a BS in Accounting.

Rick Crowley

Director, Solution Engineer

Rick leads the design and implementation of enterprise solutions for clients, leveraging both the Microsoft Business Application stack and the SIS Construct 365 Suite. As a skilled analytical thinker dedicated to enhancing process efficiency, Rick has engineered solutions for over 30 projects at SIS. With more than decade of experience in the Architecture, Engineering, and Construction industry, he possesses a deep understanding of the technological challenges organizations face. Rick holds a Bachelor’s degree in Industrial and Systems Engineering with a concentration in Supply Chains from Georgia Tech, where he graduated with highest honors. Outside of work, he treasures time with his wife and their three young daughters.

Chris Kouloukas

Director, Business Development

Chris is an executive with an extensive career in developing business relationships. He has over 30 years of leadership roles while scaling enterprises that supported B2B products. He deeply understands the customer’s perspective and establishes a mutually beneficial environment that enables customers to achieve their short and long-term goals. His experience allows him to align sales motions with implementation success. Chris’s value to the customer is not his technical prowess but the practical use of technology to help customers transform business operations and prepare for the future.

Abeljohny Anandan

Abel is a driven professional with comprehensive knowledge in managing, consulting, architecting, and delivering a portfolio of Microsoft Dynamics AX and 365 solutions and services to global customers.

Laurie Jimenez

Laurie Jimenez has over 30 years of experience in the construction industry, specializing as an ERP consultant, project manager and functional delivery lead. Her clients have included general and specialty contractors, home builders, and property management organizations. Laurie excels in project management, particularly with ERP accounting software packages, business process improvement, and end-user curriculum development. She has extensive experience in implementing, testing, training, reporting, billing, and project change management. Laurie is currently the Principal Delivery Lead at SIS, LLC where she oversees the delivery of ERP solutions, ensuring successful project outcomes and client satisfaction. Laurie has been actively involved with the National Association of Women in Construction (NAWIC) at local, regional, and national levels. Additionally, Laurie holds several certifications, including PMP (Project Management Professional) from the Project Management Institute (PMI), Certified Accounting Consultant, Distinguished Toastmaster from Toastmasters International, and certifications in Dynamics 365 Finance Core and Dynamics 365 Financials.

Sylvia Adel

Sylvia has been with SIS since 2006 and rose from the ranks to become the Corporate Controller in mid-2018.  She oversees and is highly involved in the day-to-day business financial operations.  In addition, she is engaged in other activities outside the usual accounting tasks like Onboarding of the company’s human resources, insurance, and compliance management, to name a few. Sylvia graduated with honors from the University of the East with a BSBA Major in Accounting in the Philippines.  She also got her professional license as Certified Public Accountant.  She is passionate about her work and wants to help SIS grow and be successful in her own way.

Chris Relihan

Chris began his career in ERP recruitment, working for one of the largest Microsoft Technology Recruitment firms in the world. During that time, Chris played a integral role, as Vice President, in growing their Key Accounts Delivery Team, focused in servicing the Microsoft Partner Channel community. Having placed over 100+ Microsoft Dynamics AX/D365 professionals and servicing over 30+ Microsoft Certified Partners, Chris established a knack for attracting the best and the brightest professionals in our space. Chris graduated as a Student Athlete with a Bachelor of Finance and concentration in Economics from Iona University and was a 4-year participant on their NCAA Division 1 Men’s Soccer Team.