Ken Seiff
InvestorManaging Partner at Blockchange Ventures
New York, New York
Writes $100K β $5M checks Β· typically $1.5M
About
Ken Seiff is Managing Partner at Blockchange Ventures, a venture capital firm he launched in 2017 to invest in early-stage blockchain technology companies and protocols. Prior to founding Blockchange, he co-founded Beanstalk Ventures alongside Novel TMT, which focused on early-stage retail technology investments. His career spans over 25 years in building and investing in businesses across blockchain and internet industries, including roles at Brooks Brothers, Amazon.com, Poppin, and Bluefly.com.
Experience
- Blockchange VenturesManaging Partnercurrent2017 β presentMiami, Florida, United States
- Beanstalk VenturesManaging Partnercurrent2013 β presentMiami, Florida, United States
- Simply GumMember of the Board of Directorscurrent2013 β presentSan Francisco, California, United States
- Seiff & Company LLCCEOcurrent2008 β presentMiami, Florida, United States
- PredictSpring IncMember of the Board of Directors2014 β 2023San Francisco Bay Area
- Kule LLCMember of the Board of Directors2000 β 2022New York City Metropolitan Area
- Brooks BrothersEVP, Direct and Omni-Channel2011 β 2013New York City Metropolitan Area
- Poppin (FLOK LLC)Co-Founder2009 β 2011
- Glowcast Ventures, LLCCo-Founder & CEO2004 β 2009
- Shop.org and NRFBoard Member2002 β 2004
- Bluefly, Inc.Founder & CEO1998 β 2004
- Pivot Rules Inc.Founder & CEO1991 β 1998
Education
- The Wharton SchoolBS Economics, Entrepreneurial Management1983 β 1986
- Phillips Andover Academy1978 β 1982
Skills & more
E-commerce99Web Analytics23Online Marketing15Online Advertising38Start-ups99Digital Marketing33Entrepreneurship94Marketing35Business Strategy27Sales13SEO2Multi-channel Marketing2
+12 more
Strategic PartnershipsProduct DevelopmentBusiness DevelopmentBusiness Start-upsSales and MarketingBrand DevelopmentRetailAdvertisingLeadershipStrategyVenture InvestingDeal NegotiationsFrom Ken's professional profile.
Same school
Also attended The Wharton School1,366
Fred WilsonCo-founder & Partner at Union Square VenturesJosh KopelmanFounder and Partner at First Round CapitalAydin SenkutFounder & Managing Partner at FelicisKatie RiesterPartner, Head of Investor Relations at Felicis VenturesTrevor OelschigInvestment Team at General CatalystRebecca JamesInvestor at Index Ventures
+ 1,360 more
Shared employers
Also worked at Beanstalk Ventures1
Also worked at PredictSpring Inc1
Also worked at Brooks Brothers4
Also worked at Poppin (FLOK LLC)1
Colleagues at Blockchange Ventures
Network3
Bobby Lent
Managing Partner at Hillsven
Christopher Heymann
Partner at 1k(x)
Jason Mendelson
Managing Partner at Foundry Group
Investors connected to Ken in public investor directories β a warm-intro map.




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