H1
H1 sells AI software that helps healthcare companies find and connect with doctors. It has raised $234M and employs 566 people. Its database covers 258M public professional profiles.
The growth story
H1 grew from 540 to 566 employees between 2022 and 2026, raising $234M along the way, most recently a Series D in May 2026.
About
H1 builds a platform that uses AI to match healthcare organizations with doctors for clinical research, patient referrals and other needs. It combines healthcare data with AI workflows to help pharma, health plans and hospitals optimize doctor engagement.
The company has raised $234M, most recently in a Series D round in 2026. It employs 566 people, with engineering making up the largest function at 43 staff.
Founders and leadership
Engineering is the largest function at H1, with 43 staff. The company has a median tenure of 3 years, suggesting moderate turnover. Leadership includes founders from 2017 and investors like Altimeter Capital and CVS Health Ventures.
The H1 org chart
Ariel Katz (CEO & Co-founder) leads 60 mapped leaders with 2 direct reports. Click +N to expand a team; names link to the person’s public profile.
Departments, and which ones grew
Headcount by function: Research 96 (+2% YoY), Engineering 77 (+17% YoY), Information Technology 56 (+4% YoY), Customer Success and Support 34 (+62% YoY), Sales 31 (+24% YoY), Quality Assurance 26 (+13% YoY).
Talent flow
H1 hires heavily from Shore Group Associates (26 alumni) and Cognizant (11). Its employees often move to Veeva (8 alumni) and Norstella (5). Many studied at Osmania University (7) and Andhra University (4).
Most common previous employers of H1 staff: Shore Group Associates (26), Cognizant (11), Thomson Reuters (9), GD Research Center Pvt. (8), Clarivate (7), SHORE INFOTECH INDIA PRIVATE (7). Former H1 employees most often moved to Veeva (8), Norstella (5), Amazon (4), Patient Discovery (4), Salesforce (4), Google (4).
Alumni worth knowing
The H1 mafia
H1 alumni have founded 23 companies, including Forage AI (157 staff), Lumio Solutions (41) and Keebler Health (33).
24Aaron Calvo, was Consultant - Data Automation until 2018Edward Vincent, was President until 2018Andrew Stickney, was Chief Of Staff until 2022Kevin Hill, was VP, Machine Learning until 2022Froilan Mendoza, was VP Engineering until 2019Jeff Plourd, was Senior Software Engineer until 2022
Anandesh Sharma, was Software Engineer until 2022
Patrina Pellett, PhD, was VP Global Strategic Accounts until 2022
Anatoly Geyfman, was Vice President & General Manager, Medical Devices until 2023
Avery Teplow, was Partnerships until 2020
Tiago Barros, was VP, H1 Connect until 2024
Peter Newton, was VP Global Strategic Accounts until 2022
Pragya Sharma, was Sr. Staff SDET (Sr. SDET Manager) until 2025
Sarah Bevan, was Senior Account Executive until 2023
Camilo Henao, was Program Manager: Data Operations until 2023
Scott Christensen, was Head of Product Design until 2022
Elizabeth Fennell, was Director Integrated and Content Marketing until 2024
Lisa Baden, was VP Finance until 2023
Nathan Yastrab, was Executive Vice President, Research until 2019
Mia Khalid Shibly, was Business Development Executive until 2021
William Hickson, was Chief Data Officer and Vice President until 2021
Nayanica Banerjee, MHA, was Senior Manager until 2025Hiring now
What this company is made of
Most common skills at H1: Microsoft Excel (119), Microsoft Office (107), Leadership (106), Data Analysis (98), Research Skills (90), SQL (90), Project Management (86), Communication (80).
Where the team actually sits
H1 people are concentrated in Telangana, India (67), New York, United States (34), Karnataka, India (16), New York City Metropolitan Area (14).
Search footprint
H1 attracts about 6 organic search visits a month, traffic worth roughly $0K a month if bought through ads. It gained 12 ranking keywords and lost 5 in the last period.
What employees say
- Compensation
- 3.80 / 5
- Career opportunities
- 3.50 / 5
- Senior management
- 3.50 / 5
- Work-life balance
- 3.80 / 5
Frequently asked
H1 has 566 employees as of September 2026.
H1 has raised $234M in total, most recently a Series D round in May 2026.
H1 was founded in 2017 by Ariel Katz, Ian Sax.
Ariel Katz (CEO & Co-founder) sits at the top of H1's reporting structure, with 2 direct reports.
The most common previous employers of current H1 staff are Shore Group Associates (26 people), Cognizant (11 people), Thomson Reuters (9 people).
Former H1 employees most often move to Veeva (8), Norstella (5), Amazon (4).
At least 23 companies have a founder who previously worked at H1, including Forage AI, Lumio Solutions, Keebler Health.
H1 attracts about 6 organic search visits a month, worth roughly $0K a month in equivalent ad spend.
The most common skills among H1 staff are Microsoft Excel, Microsoft Office, Leadership, Data Analysis, Research Skills.
H1 staff are concentrated in Telangana, India (67), New York, United States (34), Karnataka, India (16).
H1 has about 96 people in Research, up 2% over the past year, as of September 2026.
H1 has about 77 people in Engineering, up 17% over the past year, as of September 2026.
Computed from 258 current and 353 former H1 profiles, as of September 2026. Source: Crustdata.
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