Formula Team


Michael G. McMackin


For more than two decades, Michael McMackin has provided leadership and innovation in the payments industry. Michael has led development and introduction of many innovative FinTech product and service offerings for the Internet, banking, hospitality, and retail industries.

Prior to his role as CEO of Formula, Michael was the co-founder and President of International Payments (IP) Companies, where he oversaw acquisitions and directed affiliate and partner programs. It was in this role that Michael began to see the further need for systemic design for processes and governance specifically for the payments industry. He developed systems that enabled continuity of process across multiple banks, processors, and value-added re-sellers. His design alleviated multiple relational frameworks and streamlined acquiring programs for third-party partnerships. This would later become the genesis for the Formula. Mr. McMackin is also today, President of Transactent Technologies, Inc. a software company he co-founded.

Before co-founding IP, Michael was the CEO of AmericaOne. Mr. McMackin also served as CEO of Exclusive USA Marketing Corporation (EUSA) for the USA Processing / Bank of America Merchant Services Program, where he led the operations and the sales teams. He was responsible for more than 90 independent sales offices nationwide and helped deliver tens of thousands of new merchant clients to the company. Under the McMackin’s leadership, USA became the nation’s largest debit processing center. 

Michael majored in business administration and economics at Westmont College in Santa Barbara, California.


David McMackin


Since 1993, David McMackin has delivered advanced solutions in the payments industry. At Formula, he continues that mission by offering the industry's first comprehensive enterprise management and sales engine suite. 

Prior to Formula, David co-founded and served as CEO of International Payments. Prior to International Payments, David co-founded and served as President of AmericaOne. The company aggregated approximately 17,500 merchants during his tenure. Mr. McMackin is also today, CEO of Transactent Technologies, Inc. a software company he co-founded.

Prior to AmericaOne, David co-founded and served as President of Exclusive USA Marketing Corporation (EUSA), which controlled national marketing rights to the USA Processing / Bank of America (NYSE: BAC) Merchant Services Program. Under his leadership, the company delivered merchant enrollments from outside Bank of America's internal branch structure that exceeded all previous third-party volumes experienced by BofA. Concurrently with his involvement in EUSA, Mr. McMackin served as the Senior Vice President of USA Processing which partnered with BofA and First Data Corporation to provide cash-advance services to the gaming industry. During his tenure, USA's companies initiated merchant processing services for more than 30,000 merchants.

Mr. McMackin shares his commitment to industry excellence with the Electronic Transactions Association (ETA), where he recently completed a second-term as a member of its Board of Directors. David has served on the Nominating Committee of the ETA and was the chairman of the Driving Committee for the ETA Network Exposition. He served on the ETA Presidential Advisory Committee and as ETA Chairman of the ISO Advisory Committee. Mr. McMackin also served on the advisory board of an industry–leading publication, The Green Sheet Magazine.

David majored in business administration and marketing at San Jose State University in California.


Art Porth

Executive Vice President

Art  provides strategic oversight and development of Formula's technical operations, from systems design to partner integrations and network-build-out. Prior to Formula, Art held strategic operations positions, including General Manager of Technical Operations for Advanced Technology Services. He has managed diverse teams dealing with ERP / CRM critical systems, architecture, virtualization, maintenance, quality control, and Service Desk Level I – III. His global partners included Caterpillar, Fuji Film, Johnson & Johnson, Kiewit, Panasonic, and Sears.

Art has developed business channels in entrepreneurial markets for multiple payment industry leaders such as Cerberus, Chase Merchant Services, CitiBank, First Data, and Goldman Sachs. Art has achieved certifications in ITIL Foundations, Lean Management, COBIT 5, 6 Sigma Greenbelt / Executive Management & Total Quality Management, along with a Bachelor of Science in Business Management / Accounting from National University. 

Art serves as a volunteer coordinator for Northern Illinois Charities such as Northern Illinois Food Bank, Feed My Starving Children, Marklund Home, and Habitat for Humanity.  


Stephan Gross

Chief Financial Officer

Steve Gross is a founding executive of Formula. As CFO, Steve oversees the accounting, business support, financial planning, treasury, investor relations, M&A, and tax functions at Formula.

For 35 years Steve has provided business counsel, capital formation, direct investment, and advisory services to privately held companies, including HotPalm, NetEffect, WebMD, and many others. He has consulted, audited, or assisted in exit events with companies throughout the United States and Europe, and has participated in the capital raise and financing for hundreds of businesses, providing capital totaling hundreds of millions of USD. Steve has assisted management teams in growing, governing, and merging or selling companies to many major international groups.

Prior to joining Formula, Steve was a partner in a Chicago–based International accounting Firm, where he became National Director of Business Advisory Services and was a member of the Governing Board. Upon consolidation of this firm into a larger International firm, he became founding organizer of HLB Gross Collins, a large regional accounting firm in the Southeast, and a network member of HLB International. Steve currently serves on the Board of Legg Mason Fixed Income Partners, based in Baltimore and Pasadena.

Mr. Gross graduated from Duke University with a major in management sciences. He attended graduate school at Georgia State University, majoring in accounting. He has taught strategic business planning, executive development, real estate finance, tax planning, corporate finance, and financial controls to CPAs, and served as a national speaker and trainer on these subjects.


Konstantin Wiener

Chief Software Architect

Konstantin Weiner has overseen the information system operations and software development teams at Formula.

Before Joining Formula, Konstantin established and managed TempoDynamics Group, Inc., a technology consulting company. He has contributed systems and software engineering expertise to technology companies, including Bloomberg L.P., iBEAM Broadcasting, Net2phone, and xADIR Technologies. At Bloomberg, Mr. Weiner managed a team of 18 software developers who built many facets of the acclaimed Bloomberg Terminal, much of which is still in use today.

Konstantin holds a Master of Science degree in Computer Science from Courant Institute of Mathematical Sciences at New York University.


Len Marmino

Senior Vice President of Sales

Len Marmino designed and implemented many aspects of the technology platform that is foundational to Formula’s “designed for humans” software suite for the payments industry.

Prior to Formula, Len Marmino was National Sales Manager at International Payments. Before joining IP, Len served as National Sales Manager of AmericaOne, where he developed innovative training, operational, and sales strategies.

Prior to AmericaOne, Len spent 14 years with First Data Corporation, the world’s largest credit card processing company. During his tenure, he was first or second in First Data's "Man of the Year" awards for over eight years running and achieved "Sales Manager of the Year" six times. As Senior Regional Sales Manager, he led sales teams that were top revenue-producers from 2002 to 2005. Len was responsible for over $3 billion in new sales volume. He is a graduate of Michigan State University.