Lumesis is completely dedicated to serving the municipal market – one that has historically been underserved by technology. Our team is the heart of everything we do. We want to hear from you. Contact us at or on any of our Linked In pages.

Gregg Bienstock, Esq.
Gregg Bienstock, Esq.CEO and Co-Founder
Board Member
Before co-founding Lumesis, Gregg spent more than thirteen years with Ambac Financial Group where, most recently, he was responsible for Strategic Initiatives and previously served as Chief Administrative Officer and Employment Counsel.

He is a frequent speaker on municipal market compliance and has authored several articles on current regulatory issues impacting the municipal market.

Gregg is a 1991 graduate of Brooklyn Law School. He received his B.S. in Business and Economics from the University of Maryland. He serves as a member of the Board of Directors of The Children’s Village, leads a fund-raising initiative (“Tri-ing for CV”) for the Children’s Village and is an amateur triathlete.

Timothy Stevens, CFA
Timothy Stevens, CFAPresident, COO and Co-Founder
Board Member
Prior to co-founding Lumesis, Tim spent over fourteen years with Ambac Financial Group where, most recently, he was a Senior Managing Director and led all Capital Markets activity including management of the company’s investment portfolios, the Guaranteed Investment Contract business, the Global Interest Rate Derivatives business and the Global Secondary Markets Group.

Tim holds a B.S. in Business and Economics from Lehigh University. He currently holds the Chartered Financial Analyst designation and was a licensed Certified Public Accountant during the years that he practiced accounting. He was also registered with FINRA as a General Securities Representative (Series 7) and a General Securities Principal (Series 24). Tim is a member of the National Federation of Municipal Analysts.

Vincent Aubrun
Vincent AubrunChief Technology Officer
VP of Engineering
Vincent joined Lumesis with over 25 years of experience in leading application and infrastructure architecture, software development, and systems integration of open source and proprietary technologies. Prior to joining Lumesis, Vincent was the CTO of Calypso Technology where he led the transformation of the core product technology and architecture leveraging Open Source solutions to deliver scalability, multi-tenancy and Web interface. He also created a SaaS offering based on the Calypso product.

Vincent holds a Diplôme d’ Ingénieur (EE) from l’Ecole Nationale Supérieure des Télécommunications, Paris, France. He also holds a Master in Computer Science from New York University.

L.K. Tan
L.K. joined Lumesis with 20 years of finance experience. Prior to joining Lumesis, L.K. held various roles at American Express, most recently, as Finance Director in Global Advertising & Brand Management. L.K. earned an MBA in Finance & Accounting from the Stern School of Business at New York University, and a Bachelor of Arts in History from Stanford University.
Michael C. Craft, CFA
Michael C. Craft, CFAManaging Director, Credit
Mike joined Lumesis with over 25 years of experience in municipal bond industry. Prior to joining Lumesis, Mike spent 16 years at Fidelity Investments where he held various roles within Fixed Income, including: Municipal Credit Analyst, Head Trader on the Municipal Bond desk, and Manager for Municipal Bond Separate Accounts. Mike holds an MBA in Finance from the Stern School of Business at New York University, a BA from Amherst College. He is a CFA charter holder.
K. Justin Coombs
K. Justin CoombsDirector of Data
Product Management
Justin directs the Data Management team and heads many of the data and software product management initiatives at Lumesis. In addition to these responsibilities, Justin actively participates in Client Services matters, Quality Assurance efforts, system implementation efforts and system integration projects. Justin holds a Bachelor of Science from Fordham University.
Pete M. Newman
Pete M. NewmanManaging Director,
Business Development
Pete joined Lumesis with over 20 years of experience in the software, financial services and communication industries, including 10 years in product development and marketing. Prior to joining Lumesis, Pete worked as Senior Vice President, Sales Manager at DPC DATA, where he worked closely with many large tier, regional and online securities dealer firms. Pete holds a BA in History from The College of Wooster.
Mark Harries
Mark HarriesManaging Director,
Business Development
Mark joined Lumesis with over 20 years of Municipal Fixed Income experience with a focus on sales, trading, and business development. Prior to joining Lumesis, Mark was a Vice President within the Capital Markets Sales Group at Ipreo LLC, where he was responsible for developing and building new business relationships with buy-side and sell-side firms. Mark holds a BS from St. Lawrence University.
Stacey Virzi
Stacey VirziDirector of Client Services
Stacey Virzi joins Lumesis as an experienced client services executive with deep expertise in financial services and data businesses. She has over 11 years experience developing and managing a client service department. Stacey previously was the Vice President of Client Services at She holds a BA from Rutgers University.
Heidi Leonard
Heidi LeonardDirector, Business Development
Heidi joined Lumesis with 15 years of experience in the financial services industry mainly involved in fixed income institutional sales, product management, and electronic trading. Heidi began her career at Goldman Sachs in Chicago, and prior to joining Lumesis worked as Vice President, Sales at TradeWeb, managing institutional relationships with money market clients in the Midwest. Heidi holds a BS in Finance from the University of Illinois Urbana-Champaign.
Sue Childs
Sue ChildsDirector of Marketing
Sue Childs joined Lumesis as Director of Marketing with over 20 years of marketing experience with companies in the media and online information space. She was EVP of Marketing and Business Development at EDGAR Online and has also held marketing and senior management positions at Simon and Schuster, The Top Right Group and been a marketing and strategy consultant. Sue holds a BA from Colby College and an MBA from Columbia Business School.

Our Board of Directors and Advisory Board

Brian Sisko
Brian SiskoChairman of the Board
Mr. Sisko has more than 25 years of experience working with start-up and growth-stage companies having served as an executive officer, investor, external legal counsel, internal counsel, and consultant. As Chief Operating Officer, Executive Vice President and Managing Director at Safeguard Scientifics (NYSE:SFE), Mr. Sisko is responsible for Safeguard’s business development and platform expansion strategies, legal affairs, mergers & acquisitions, and support of Safeguard’s board and public company activities. Mr. Sisko received a B.S. from Bucknell University and a J.D. from the University of Pennsylvania Law School.
Philip Moyer
Philip MoyerBoard Member
Mr. Moyer joined the Lumesis Board of Directors in February 2012. He is a Managing Director at Safeguard Scientifics, and brings more than 25 years of experience, most recently serving as the President and CEO at EDGAR Online, Inc. Mr. Moyer holds a B.S. in Computer Science from the University of Pittsburgh, and currently serves on the board of the Joseph M. Katz Graduate School of Business and College of Business Administration, University of Pittsburgh.
Joshua Laurito, CFA
Joshua Laurito, CFAAdvisory Board Member
Mr. Laurito is an Advisory Board Member and a founding member of Lumesis. Previously, Josh was a Managing Director at RangeMark Financial Services where he was responsible for analysis of credit and interest rate derivative products. He has also held positions at Ambac Assurance and Merrill Lynch, and currently holds the Chartered Financial Analyst designation.
Kate McDonough
Kate McDonoughAdvisory Board Member
Ms. McDonough joined Lumesis as an Advisory Board Member after retiring in 2007 from a 25 year career in municipal finance at Ambac Assurance Corporation. At Ambac, she served as a Senior Managing Director and co-head of the firm’s Public Finance business. Ms. McDonough currently serves as a public member on the Municipal Securities Rulemaking Board. Ms. McDonough graduated summa cum laude from Fordham University with a BS in Accounting and earned her JD from Fordham Law School.
Michael J. Vossler
Michael J. VosslerAdvisory Board Member
Mr. Vossler brings over 20 years of experience serving in the software solutions business to his role as an Advisory Board Member at Lumesis. Mr. Vossler served as a Senior Vice President at SunGard, overseeing sales and distribution for three divisions including Adaptiv, Front Arena and Sierra. Mr. Vossler holds a Master of International Management from Thunderbird School of Global Management and a BA in International Relations from Michigan State University.