About Us

Founded in 2014, GreenKey is working to redefine VOICE.

GreenKey improves collaboration, captures data, and empowers compliance, all while reducing cost. Our patented software turret functionality and industry leading AI speech recognition and data extraction combine to make voice communication significantly simpler, smarter and more cost-effective.

Management Team

Nader Shwayhat


Nader Shwayhat is our Chief Executive Officer, has spent the past 15 years leading and building fast-growth, venture-backed FinTech businesses focused on real-time communication, trading workflows, and big-data analytics.  Holding several patents on chat-based technologies, he has been at the forefront of how unified communications can integrate into the trading and compliance workflows of today’s front, middle, and back-office professionals.  Nader earned a bachelor’s degree in mechanical engineering as well as a master’s degree in financial and operations engineering from the University of Michigan.

Anthony Tassone

Co-Founder & CPO

Anthony Tassone is our Chief Product Officer. He is a domain expert and quantitative strategist with a proven track record of building out world class development teams. Anthony has held executive positions at various financial market firms including trading software vendors, exchanges and proprietary trading firms.  Anthony grew up in the pits working as a clerk at 15 years old on the floor of the CBOT.  He is a graduate of DePaul University.

Eric Detterman


Eric Detterman is our Chief Solutions Officer. He has a diverse background with a primary focus on cloud computing and telephony.  Eric brings with him 15 years of experience managing global development teams and building enterprise scale VoIP applications in addition to non-linear, quantitative trading systems. Prior to GreenKey, he was the Founder and CEO of Sold Logic, a custom application and cloud infrastructure solutions provider.  Eric has a BS in Economics from Oakland University.

Brad Mrumlinski

VP of Engineering

Brad Mrumlinski is our VP of Engineering and is the lead architect behind GreenKey’s cloud-ready voice platform. Prior to joining GreenKey, Brad worked at CrypTrader designing and developing the front end dashboard and trading interface, as well as all the backend APIs.  Throughout his career Brad has been a keen advocate of the open source movement and has contributed to various projects.  He has a degree from Columbia in digital audio production & acoustical engineering.

Tejas Shastry

VP of Data Science

Tejas Shastry is our VP of Data Science and has built machine learning algorithms across a variety of industries, including consumer electronics, materials research, and behavior recognition. Tejas has 10 years of full-stack development experience and holds a PhD in Materials Science and Engineering from Northwestern University. Prior to Green Key, he was the Co-Founder and CEO of AMPY.

Richard Garnier

Head of Int’l Business

Richard Garnier is our Head of International Business and is a 30 year veteran of financial and information technology.  Richard previously headed Thomson Reuters in Northern Europe following a series of leadership roles at high growth businesses including Internet Securities, Raw Communications, Datamonitor and Financial Times. He brings with him extensive capital markets experience and an operating track record in EMEA & Asia.  Richard holds a BSc in Econometrics and a MSc in Political Science from the University of London.