Our Leadership Team

Emgerency Notification Employee

Paul Shain - President and Chief Executive Officer

Paul Shain is President and Chief Executive Officer of Singlewire. He has led the strategic direction of the company since its founding in 2009. Under Paul’s direction, the Singlewire team has grown from a handful of people to over 100 employees.

Paul is a seasoned technology industry executive who previously was Senior Vice President and Executive Committee Member at CDW, a leading provider of technology products and services for business, government, and education.

Prior to CDW, Paul was CEO of Madison-based Berbee Information Networks Corporation, a wholly-owned subsidiary of CDW Corporation, acquired by CDW in October 2006. Paul began his career in the Investment business, serving as Managing Director and Director of Research for Robert W. Baird & Co., Inc., a regional investment banking firm headquartered in Milwaukee, WI. Paul’s focus at Baird was the Information Technology Services space.

Paul graduated from the University of Wisconsin - Madison with a bachelor’s degree and MBA in finance. Paul holds the Chartered Financial Analyst (CFA) designation and has served on executive partner councils for both IBM Corporation and Cisco Systems. In addition, Paul currently serves on the board of directors for Fiduciary Management Inc., American Family Insurance Company, and the Wisconsin Foundation and Alumni Association.


Greg Sliwicki

Greg Sliwicki - Executive Vice President of Sales and Marketing

Greg Sliwicki leads worldwide sales for Singlewire. In this capacity, he is responsible for the strategy to expand the company's customer base and revenues. Under his leadership, the company has grown from 1,000 customers to over 8,000 in 56 countries.

Greg is a seasoned technology sales executive who was previously Group Vice President at CDW. Prior to CDW, Greg was President of Madison-based Berbee Information Networks Corporation, which was acquired by CDW in October 2006. During his tenure at Berbee, revenues grew from $27 million to nearly $500 million. Greg led the effort to integrate Berbee’s field-based sales force with CDW’s inside team. He began his career with IBM, holding various sales positions over a 15-year tenure.

Greg graduated from the University of Wisconsin - Madison School of Business (BBA) and currently serves on the board of directors for Singlewire Software. He is a past president of Optimist International and has also served on the boards of Valicom and Liveality.


Brett Rimkus

Brett Rimkus - Chief Financial Officer

Brett Rimkus serves as Singlewire's Chief Financial Officer. Having participated in the March 2009 company formation, he currently is responsible for finance, internal IT, human resources, and legal aspects of operations.

From 1997 to 2006, Brett served as Chief Financial Officer for a regional technology reseller and managed service provider. During his tenure, revenues grew from $18 million to nearly $500 million. In 2006, the company was acquired by a Fortune 500 company and Brett co-led the integration of the companies and served in various executive positions through 2008.

Prior to these roles, Brett gained more than 12 years of experience working in the public accounting industry.

Brett graduated from the University of Wisconsin - Whitewater with a bachelor of business administration degree in accounting. He holds the Certified Public Accountant (CPA) designation. Brett is a founding director of the Fitchburg Chamber of Commerce and served on its board of directors for five years. He also serves on the advisory board for Cascade Asset Management LLC, on Madison Development Corporation’s Venture Debt Fund Advisory Committee, and as Treasurer for Technology Education Foundation. He has participated in a public school site council, parent-teacher organization, coaching youth basketball, and is working on his tree pose. Namaste.


David Tucker

David Tucker - Senior Vice President of Business Development

David Tucker joined Singlewire Software in 2016 and serves as the Senior Vice President of Business Development. His focus is to expand Singlewire’s strategic partnerships and grow its presence among businesses and public sector entities worldwide.

One of the founding members of the Collaboration business at Cisco, Tucker previously led the worldwide Collaboration Go-to-Market efforts and drove product simplification across the Collaboration Technology Group (CTG) portfolio.

Beginning in 2005, Tucker was the Vice President and General Manager of Cisco’s Small Business Technology Group (SBTG). He was responsible for addressing the “Connect” elements of Cisco’s mid-market networking strategy. As part of that effort, he managed the innovation and expansion of product solutions, which included the integration of small business best practices and alignment with Cisco’s existing products.

Tucker joined Cisco in 1998 as part of the Selsius Systems acquisition. As Co-Founder, President and Chief Executive Officer of Selsius, he helped to pioneer the consolidation of voice and data networks and led the vision to create the first IP PBX. He later held various roles in General Management and Business Development at Cisco.

Prior to Selsius, David served in leadership roles at technology companies where he was responsible for notable innovations like the creation of an enterprise video PBX platform, Incite. His initial experience began within the PBX and Call Center industry, managing sales teams, and delivering high-value solutions to enterprise customers.

David holds a bachelor’s and master’s degree in business administration in marketing from Texas A&M University.


Jerry Steinhauer

Jerry Steinhauer - Chief Technology Officer

Jerry Steinhauer is responsible for Singlewire product architecture, as well as integrating Singlewire products with those of third parties. He played a large role in the creation of the InformaCast mass notification system, as well as the many developments that have shaped it into the product it is today. Following the OEM agreement between Singlewire Software and Cisco Systems, Jerry served and continues to serve as a Singlewire representative to Cisco Systems and is a valued member of the team there as well as at Singlewire.

Jerry has over 20 years of IT experience. He joined Singlewire from Berbee/CDW, where he was a thought leader and developer in the Unified Communications engineering group. Jerry joined Berbee in 1995 and began working with Cisco voice on CallManager 2.4 in 1999. He used his unique mix of technical and development skills to help build and support CDW’s UC engineering group across the Midwest.

Jerry holds a bachelor of science degree in computer science with an emphasis in systems programming from the University of Wisconsin - Madison. He has also been Cisco Voice CCIE #12504 since 2003.


Amber Field 

Amber Field - Vice President of Software Development

Amber Field joined Singlewire in 2017 to initially develop our project management practice. She now directs the Project Management, DevOps, and Development teams and is responsible for many of Singlewire's enterprise-level, scaling, and growth initiatives.

Amber has nearly 15 years of experience in the software industry. She spent her early career as a software engineer for IBM, which included a stint in Tanzania helping seven Maasai tribes lift themselves out of poverty. She became a Project Manager for National Geographic, fell in love with the agile methodologies, and transitioned the entire organization to agile software development, before leaving to lead a team of program managers at Opower (acquired by Oracle in 2016), a company focused on using behavioral science to help people save energy. Amber's most recent position was as Head of Operations for Capitol One's Innovation Lab. Amber is passionate about agile software development, women in tech, travel, and mentoring.

Amber has a Bachelor's degree in Computer Science & Spanish from the University of Wisconsin-Madison. She regularly speaks at meet-ups and conferences about agile software development and has been a guest lecturer at Harvard Business School. Outside of work, you might find Amber in a kayak, the boxing gym, with her daughters, or on top of a mountain with extremely muddy shoes.