Seifer is a 25-year digital advertising industry veteran and currently leads Mediavest's investment practice, which covers video, publishing, outdoor, mobile, search, social, programmatic, and local marketplaces.
Clients include Honda, Heineken, and Comcast.
Prior to joining Mediavest, Seifer was senior vice president of strategy at Millennial Media, the ad tech company acquired by AOL for $238 million in 2015.