People · Operator

JEFFREY S. MATHIESEN

Named in public records as an officer, director or promoter · active 2013–2025 · Biotechnology, Pharmaceuticals, Healthtech

4
Companies
25
Filings
$91.8M
Combined raised · real
Serial
Operator type
Companies
CompanyRoleSectorStageRaised · realValue · estTied
CHF Solutions, Inc.BiotechnologySeries A$33.0M$17.0M2013
Sun BioPharma, Inc.PharmaceuticalsSeries A$22.3M$13.0M2016
NEUROONE MEDICAL TECHNOLOGIES CorpBiotechnologySeries A$21.2M$1.4M2017
Helius Medical Technologies, Inc.HealthtechSeed$15.4M$13.4M2020
Operator network

JEFFREY S. MATHIESEN at the center, the companies they're named on, and every other operator named alongside them — an interlock map of shared founding teams, boards and funds. Name-matched, so treat as a research lead.

Paul Buckman · 10 companies · 1 sharedPaul BuckmanDavid Rosa · 5 companies · 1 sharedDavid RosaJohn L. Erb · 5 companies · 1 sharedJohn L. ErbJon Salveson · 5 companies · 1 sharedJon SalvesonGregory D. Waller · 4 companies · 1 sharedGregory D. WallerJohn Erb · 3 companies · 1 sharedJohn ErbMark Harvey · 3 companies · 1 sharedMark HarveyWarren Watson · 3 companies · 1 sharedWarren WatsonWilliam Peters · 3 companies · 1 sharedWilliam PetersDonal O'Dwyer · 2 companies · 1 sharedDonal O'DwyerGeoffrey Brooke · 2 companies · 1 sharedGeoffrey BrookeGregory Waller · 2 companies · 1 sharedGregory WallerDavid A. Rosa · 5 companies · 2 sharedDavid A. RosaPaul A Buckman · 3 companies · 2 sharedPaul A BuckmanDAVID B. KAYSEN · 4 companies · 1 sharedDAVID B. KAYSENJ. ROBERT PAULSON · 4 companies · 1 sharedJ. ROBERT PAULSONJ. Robert Paulson, Jr. · 3 companies · 1 sharedJ. Robert Paulson…D. Robert Schemel · 2 companies · 1 sharedD. Robert SchemelPaul S. Buckman · 2 companies · 2 sharedPaul S. BuckmanJonathan M. Sackier · 4 companies · 1 sharedJonathan M. Sacki…Dane Andreeff · 2 companies · 1 sharedDane AndreeffEdward M. Straw · 2 companies · 1 sharedEdward M. StrawCHF Solutions, Inc. · $33.0M raisedCHF Solutions, Inc.Sun BioPharma, Inc. · $22.3M raisedSun BioPharma, Inc.NEUROONE MEDICAL TECHNOLOGIES Corp · $21.2M raisedNEUROONE MEDICAL TECH…Helius Medical Technologies, Inc. · $15.4M raisedHelius Medical Techno…JEFFREY S. MATHIESENJM
JEFFREY S. MATHIESEN Company Co-operator (ring = serial)Hover to isolate ties · click to open
Co-operators (shared boards)

People named alongside JEFFREY S. MATHIESEN on the same companies — an interlock signal (shared founding team, board, or fund). Name-matched, so verify before acting.

OperatorSharedTheir companies
David A. Rosa25
Paul A Buckman23
Paul S. Buckman22
Paul Buckman110
Jon Salveson15
David Rosa15
John L. Erb15
Gregory D. Waller14
DAVID B. KAYSEN14
J. ROBERT PAULSON14
Jonathan M. Sackier14
J. Robert Paulson, Jr.13
John Erb13
Mark Harvey13
William Peters13
Warren Watson13
Jeffrey E Jacob12
Michael T. Cullen12
PAUL W. SCHAFFER12
Paul R. Buckman12

People are matched by normalized name across records; a common name may merge distinct individuals. Treat as a research lead, the same way modeled valuations are directional, not quoted.