Daniel Mangelsdorf, Managing Partner
Daniel Mangelsdorf is the Managing Partner for SDI Communications. Dan draws on his breadth of first-hand leadership experience in Operations, Sales, Marketing, New Product Development and Information Technology to bring informed and unique insights to clients. He has extensive experience in a wide range of functional areas across industries, as well as advising large global and small entrepreneurial companies.
Prior to joining SDI in 2002, Dan spent 12 years in the high-technology industry. He was Vice President, Global Marketing for the Service Provider Voice Business, at Nortel Networks, a telecommunications equipment supplier. His business unit brought in four billion per year in revenue. In that leadership role, he dealt with maximizing revenue and profit contribution from a mature business, while simultaneously innovating and building new product lines. During his 5-year tenure, Nortel became a market leader for the next generation of voice switching equipment. He was also a steering committee member of Nortel’s leadership development program and a mentor in the female executive mentoring program.
Before joining Nortel, Dan held several senior leadership positions with NetEdge Systems, a technology startup, which included responsibility for new product introduction, global planning, logistics and sales engineering. He also held positions in Operations, Supply Chain and Manufacturing at Solectron, Baker Oil Tools and Sun Microsystems.
Dan graduated with an M.B.A from Rice University and a B.S. in Management from Santa Clara University. He lives in the Research Triangle Park area of North Carolina with his wife and has three children.
Liza Herschel, Partner
Liza Herschel is a Partner for SDI Communications. Liza draws on an extensive background both in education and marketing and an applied practice of leadership and high-performance consulting in a wide range of industries and functional areas.
Prior to joining SDI in 2007, Liza was Senior Director at ZAMWorks, a marketing and media firm based in New York City. She was the primary liaison to zoos, aquariums and other nature-based groups throughout North America, Europe, Africa and the Philippines. She also directed the development and national distribution of a unique conservation curriculum for middle school students. During her 7-year tenure at ZAMWorks, she coached and developed staff to run the program she created.
Before joining ZAMWorks, Liza was Assistant Director, Conservation Education, at the American Zoo and Aquarium Association. She coordinated the national-level professional activities and development of conservation educators in accredited zoos and aquariums throughout North America. She also held positions in various educational roles at several zoos, including Curator at the Baltimore Zoo for six years.
Liza did her graduate studies at Antioch University in Environmental Education and graduated with a B.S. in Political Science from Brown University. She lives in Philadelphia, PA with her husband and has two daughters.
Judy List, Executive Consultant
Judy List is an Executive Consultant for SDI Communications after being a client of the firm for more than 12 years.
Prior to joining SDI, Judy spent 30 years in the consulting, telecommunications and information technology industries. She held executive positions at IBM, Unisys, BearingPoint (formerly KPMG Consulting) and Telcordia (formerly Bellcore). She led large, global organizations through major transformations while delivering consistent financial results. She helped her clients improve financial performance through the strategic use of technology across a variety of functional areas. These ranged from advanced marketing analytics, customer care, product development, large-scale systems integration of financial, HR and supply chain functions, to strategic outsourcing of IT and business processes. Her efforts always addressed the leadership needed to achieve results in dynamic and changing environments.
Judy’s early career was in academia as an Assistant Professor of Psychology at Clark University where she shared her expertise in growth and development.
Judy graduated with a Ph.D. in Developmental Psychology from the University of Minnesota and a B.A. in Psychology, Human Development and Family from the University of Kansas. She lives in Park City, UT with her husband and has three children.
Julian Serrao, Consultant
Julian Serrao is a Consultant for SDI Communications. Julian draws on seven years of first-hand leadership experience in the education sector.
He ran a business consulting with firms, design labs, non-profits and education technology startups on a broad array of private, public, national, regional and local initiatives ranging from developing an in-district K12 innovation lab to planning a collective impact hub for student advising.
Much of his work has been geared toward expanding education access in underserved communities, including driving strategy for a startup tackling low-income public school enrollment as a part of the LearnLaunch innovation cohort.
Prior to consulting in education, Julian was a teacher who incorporated new blended learning models and created a process and context in which traditionally underserved students co-created their math learning pathways and adapted Agile processes to achieve desired outcomes.
Julian graduated from Yale University with a B.A. in Anthropology. He lives in Cambridge, MA.
Jessica Goddard, Consultant
Jessica Goddard is a Consultant for SDI Communications. Jessica brings more than 10 years of experience, particularly in the world of transformation, social impact, health and wellness.
Prior to joining SDI in 2018, Jessica was Head of Operations, Media and Editorial, at Jesra Impact, which creates breakthrough content, education and networks by empowering individuals to turn their limitations into catalysts and transform their passion into purpose. She was responsible for the publicity and delivery of workshops nationwide to all walks of life, including small-business owners and thought leaders at large organizations. In addition to creating and editing content, she managed social media channels and the production of digital offerings such as webinars and podcasts.
Before joining Jesra Impact, Jessica was Global Senior Program Manager, Editorial, at WebMD where she managed the dissemination of continuing medical education online programs in the U.S. and worldwide across a variety of therapeutic areas, reporting the latest health information to key opinion leaders in the medical field.
She also held positions as Senior Account Executive at Chamberlain Healthcare Public Relations where she consulted top executives in a broad array of PR activities around regulatory milestones, large-scale disease awareness and celebrity campaigns, data announcements, patient stories and partnerships with advocacy groups.
Jessica graduated with an M.A. in Public Communications and a B.A. in Journalism with a minor in Psychology from Fordham University. She lives in the greater New York City area with her husband and two kids.
Doreen Del Col, Operations Manager
Doreen Del Col is an Operations Manager for SDI Communications. Doreen brings more than 30 years of management experience and contributes a rich background in organizational and interpersonal skills. She has a deep passion for transformational work both personally and professionally.
Prior to joining SDI in 2004, Doreen was Vice President, Institutional Investment Group, at PNC Bank where she was responsible for maintaining the business relationships of over seventy-five high net-worth clients. She also held positions in Senior Operations and Administration at Irving Trust Company and First Fidelity Bank.
Doreen graduated with a B.S. from St. John’s University. She lives in the greater New York City area and has two sons.
Dana Rojas, Executive Assistant
Dana Rojas is an Executive Assistant for SDI Communications’ senior consulting team. Dana brings more than 20 years of administrative and executive support experience. She contributes her organizational and meeting planning skills, having successfully coordinated events for 100+ employees.
Prior to joining SDI in 2016, Dana was Executive Assistant for senior management in sales and marketing business units at Ricoh Corporation, a business service company that offers document management and digital printing solutions.
She lives in central New Jersey with her husband and daughter.
Jonathan Clark, Senior Consultant
Jonathan Clark is a Consultant for SDI Communications. Jonathan brings three decades of experience guiding top executives, professionals and entrepreneurs in elevating their individual effectiveness for organizational success.
Jonathan has worked with visionary business leaders across industries from Panera Bread and Friendly’s Ice Cream to American Express and Western Union to bring out the creativity, talent and collaboration of their people in ways that catapult their companies to optimal performance.
Jonathan has also brought his expertise to producing breakthrough charity events, resulting in his “Point of Light” presidential designation and recognition as “Person of the Week” on ABC World News Tonight for his contribution to the mission of ending world hunger.
Prior to becoming a consultant, Jonathan was a sports coach, which has enabled him to convey a unique perspective on the art and science of human action and interaction. He has had years of training in understanding human behavior.
Jonathan graduated with a degree in Structural Engineering from Hartford State Technical College. He lives in Tampa, FL with his wife and has two daughters.