Management Team


Branndon Stewart

Founder & CEO

If you’re going to build a marketing technology company, it helps to have a leader with 15 years of technology marketing experience. Branndon played a major role in growing several Austin-based startups into category leaders, including Motive (IPO), Troux Technologies (acquired by Planview) and Boundless Network (acquired by Zazzle). Most recently, Branndon served as VP of Marketing at Boundless Network, where he helped the company grow from $8 million to more than $30 million in annual revenue. He’s a Texas A&M graduate, where he played quarterback and led the Aggies to a Big 12 championship.


Sharon Slonaker

Director of People, SPHR, SHRM-SCP

Building a great company requires great people and Sharon is our people person. An HR leader with over 20 years of experience working with companies from 20-2,000 people, Sharon handles culture, recruiting and HR for OutboundEngine. She joins us from Headspring, where she grew headcount by 100% and led a culture that was consistently ranked as one of Texas’ Best Places to Work. A graduate of Texas A&M University, she’s a proud Aggie who loves spending time with her two teenagers, preferably somewhere on or near the water.


Gabe Dennison

VP, Sales and Business Development

Gabe leads business development for OutboundEngine, overseeing the company’s group/enterprise sales, national accounts, agency sales and partner programs. His prior experience includes key roles for several high-growth media, software and services companies. Most recently, he led global business development for Pluck, a leading provider of social marketing solutions for brands, retailers and publishers. Gabe holds a B.A. in English and history from the University of Texas and an MBA from the University of Oxford. He’s spent 10 years living abroad and enjoys spirited barbecue discussions.


Deepak Surana

VP of Product

Deepak sets the vision for how our software delivers value for business owners. Most recently, he was Chief Product Officer at Click Security, where he led product and engineering efforts through its acquisition in 2016. He also held senior product management roles at Blackboard, myEdu and Hoover’s, and started his career as a consultant with Accenture. He holds an MBA from the University of Texas and a BS in Engineering from Cornell University. In his spare time, you can find him playing tennis, running around Town lake, and visiting his neighborhood taco truck.


Isaac Specter

VP of Operations

A 10-year veteran of Austin’s technology scene, Isaac runs customer success, account management, data science and business intelligence. Prior to joining OutboundEngine, he held key roles in product management, business development and sales management at MessageOne, Smiley Media, Tippr and Dell. Isaac is a graduate of Duke University, a recognized expert on Austin’s restaurant scene and famous for his shoe collection.


Andrew Szatan

Senior Director of Marketing

Andrew heads the OutboundEngine marketing team. He’s responsible for customer acquisition, developing the company’s brand and creating high-performance campaigns for our clients. Prior to joining OutboundEngine, Andrew was the first marketing hire at a New York-based online education startup that scaled to over $200 million. He’s a graduate of New York University and considers a day that starts on the hiking trail and ends in a music club to be just about perfect.


Jacqueline Sewell

Sr. Director of Customer Success

Jacqueline runs Customer Success and has a passion for driving positive financial results through a customer centric approach. Her team is responsible for optimizing the customer lifecycle from onboarding, support, retention and account management, as well as optimizing APOS revenue. Prior to her current role in Customer Success, Jacqueline held roles in sales and worked her way up from Sales Representative to Sales Manager at OutboundEngine. She holds an International Business degree from Texas A&M University, where she was a founder of the school’s first all female acapella group. Outside of work she enjoys spending time outdoors and hosting dinner parties with her husband and dog.

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