He is also a General Partner at XSeed Capital and a Venture Partner at Piva. He sits on the Board of Directors of Foxeye Robotics and Avochato. He led investments in Sparta Science, Zooz (acquired by PayU of Naspers - NPN), Hive, Lex Machina (acquired by LexisNexis of the RELX Group - RELX), CirroSecure (acquired by Palo Alto Networks - PANW), Nova Credit, Disco, The League, Trove, Teapot (acquired by Stripe), Smart Coffee Technology, Pixlee and SIPX (acquired by ProQuest). He also supports other companies, such as Citrine Informatics.

Siegel is on the Board of SmartDrive Systems, is a Member of the Supervisory Board of TTTech Auto AG, and is Chairman of the Strategic Advisory Board for TTTech Computer-technik AG in Vienna, Austria. He is a Member of the Industry Advisory Boards for HERE Technologies and Tulco. He is the Co-President Emeritus of Stanford Angels & Entrepreneurs, an alumni association that fosters relationships to strengthen the Stanford startup community. Siegel has co-authored several articles for the Harvard Business Review and California Management Review, is a Wall Street Journal Startup Guru, and is a frequent contributor to Fortune, TechCrunch, VentureBeat, and Forbes.

Siegel was previously General Manager of the Video and Software Solutions division for GE Security, with annual revenues of $350 million. He was also Executive Vice President of Pixim, Inc., a fabless semiconductor firm specializing in image sensors and processors (acquired by Sony). Before Pixim, Siegel was Co-Founder & Chief Executive Officer of Weave Innovations Inc. (acquired by Kodak), a network services developer that invented the world’s first digital picture frame and delivered photos and other digital media to PCs and internet / mobile devices.