Our Team 2018-03-06T12:12:46+00:00

Our Team

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 inquiries@lumesis.com or on any of our Linked In pages.

Gregg Bienstock, Esq.
Gregg Bienstock, Esq.CEO and Co-Founder, Board Member
Gregg is the CEO and a Co-Founder of Lumesis. He is a frequent speaker on municipal market compliance and has authored several articles on current regulatory issues impacting the municipal market. Prior to 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.

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.

For more information about Gregg’s speaking engagements and published articles, click here.

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 OfficerVP 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.
Stacey Virzi
Stacey VirziManaging Director, 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 CreditRiskMonitor.com. She holds a BA from Rutgers University.
Heidi Leonard
Heidi LeonardManaging Director,Business Development
Heidi joined Lumesis in 2015 with 15 years of experience in the financial services industry 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. She currently manages business development in the Midwest. Heidi holds a BS from the University of Illinois and is currently an MBA/MS candidate at Indiana University.
John Gunther
John GuntherDirector, Business Development
John joined Lumesis with 10 years of experience in the financial technology space with a focus on sales and account management. Prior to joining Lumesis, John was Vice President of Sales at AlphaSense, a provider of financial search, indexing, and extraction technologies for structured and unstructured content. John began his career as an Account Manager at TheMarkets.com until it was was acquired by S&P Capital IQ in 2010. Subsequently, John was an Associate Director at S&P Capital IQ. John holds a BA in Economics from Vanderbilt University.
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.
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 senior management positions at Simon and Schuster and The Top Right Group and been a marketing and strategy consultant. Sue holds a BA from Colby College and an MBA from Columbia University.
Sudha Balla
Sudha BallaDirector, Data Engineering
Sudha leads development of data engineering and integration processes at Lumesis. In the past, she was part of bioinformatics research initiatives to identify meaningful patterns in large genomic data at the NIH and Sloan-Kettering Institute. Most recently, she worked as a senior software engineer to develop optimized employee scheduling algorithms for workforce management software at Timelink Inc. Sudha holds a PhD in Computer Science and Engineering from the University of Connecticut.
Sridhar Kummam
Sridhar KummamDirector, Application Development
Sridhar has over 13 years of experience in designing, developing and leading application development efforts in the financial services industry. Before Lumesis, Sridhar was VP of Markit Client Site at Markit NA, where he was instrumental in the success of Markit Single Signon initiative. Prior to that, he implemented solutions for UBS Equity Reference Data, BOfA’s Middle office and Citi (EEMEA) Branch Banking systems. He has a B.Tech in Electronics and Communications from the National Institute of Technology, Warangal.

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 has more than 25 years of experience in financial technology and enterprise software having been a CEO, entrepreneur, angel investor and software developer. Previously, he was Managing Director at Safeguard Scientifics; President and CEO at EDGAR Online; and General Manager at Microsoft. 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.