Jack Sinclair: Email & Phone Number

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Consulting CFO at Attend at Attend|New York, New York, United States

Position:

Consulting CFO at Attend at Attend

Location:

New York, New York, United States

View Jack Sinclair's Email

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Last updated: 2026-07-31

Updated: 2026-07-31

Found email addresses for Jack Sinclair:

Business emails:

j***********r@returnpath.com,

j**k@stackoverflow.com,

j***********r@returnpath.net

Personal emails:

j**************3@gmail.com,

j***********r@gmail.com,

j**********r@gmail.com

Found phones for Jack Sinclair:

+1-323-***-**90,

+1-205-***-**28

A different Jack Sinclair?

Work Experience 33 years

Consulting CFO at Attend at Attend

Feb 2025 - Current

Consultant at Tech:NYC

Jan 2025 - Current

Co-founder and CFO at Bolster El Dorado Hills, United States

Apr 2020 - Mar 2025

Consultant at Self-Employed

Feb 2020 - Apr 2020

Chief Financial Officer at LRN

Oct 2019 - Feb 2020

CFO at Return Path

Jan 2018 - Jun 2019

Chief Financial Officer at Stack Overflow

Apr 2014 - Jan 2018

Co-founder and CFO at Return Path

Aug 2008 - Mar 2014

COO at Return Path

Jan 2004 - Jan 2008

VP Finance at Return Path

Dec 1999 - Oct 2004

Managing Director at Financial Resource Group

Jan 1998 - Jan 1999

Co-founder at Periscope Systems

Jan 1996 - Jan 1997

Senior Analyst at Stern Stewart & Co.

Jan 1993 - Jan 1996

Jack Sinclair started working in 1993, then the employee has changed 9 companies and 9 jobs. On average, Jack Sinclair works for one company for 2 years 7 months.

Their professional focus is Accounts Receivable, Analytics, and Budgets across 3 core areas.

Education

BS at The Wharton School

University of Pennsylvania

Xaverian Brothers High School

Frequently Asked Questions

What is Jack Sinclair's email address?

SignalHire found verified email addresses for Jack Sinclair, both business and personal. Their business email is j***********r@returnpath.com, and personal emails include j**************3@gmail.com, j***********r@gmail.com, and j**********r@gmail.com.

What is Jack Sinclair's phone number?

SignalHire found multiple verified phone numbers for Jack Sinclair: +1-323-***-**90, and +1-205-***-**28.

How do I contact Jack Sinclair at Attend?

You can reach Jack Sinclair through SignalHire by unlocking their verified email and direct phone number (free signup, no credit card needed). SignalHire is the fastest route if you need their contact details immediately.

What is Jack Sinclair's professional background?

Jack Sinclair has 33 years of professional experience. They have held roles including Consultant, Co-founder and CFO, and Consultant at companies such as Tech:NYC, Bolster El Dorado Hills, United States, and Self-Employed. Their education includes BS from The Wharton School, and University of Pennsylvania.

Is Jack Sinclair's contact information up to date?

Yes. Jack Sinclair's SignalHire profile was last updated on 31 July 2026, reflecting their current position as Consulting CFO at Attend at Attend in United States, United States.

Jack Sinclair Namesakes

Name

Company

Position

Jack Sinclair

Catalent

Director Of Quality Assurance

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Jack Sinclair

Sprouts Farmers Market

Chief Executive Officer

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Jack Sinclair

BeOne Medicines

Director Head of Quality Assurance Compliance

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Other employees at Attend

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Company

Position

Kevin Segal

Attend

Senior Director of Accounts

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Jenny Lawton

Attend

Strategic Advisor

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Brian Richeson

Attend

EXECUTIVE VICE PRESIDENT OF BUSINESS DEVELOPMENT

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Adam Grow

Attend

Chief Strategy Officer

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Aaron Holland

Attend

Chief Executive Officer

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Jonathan Rappaport

Attend

Co-Founder

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Robert Beadle

Attend

Chief Operating Officer

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Alim Charaniya

Attend

Founding Team Member- Web, Android Engineer, Product Manager

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Devin Burns

Attend

Member Board of Directors

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Anu Vaishnav

Attend

Director of Product

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