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John Callahan Email & Phone Number

Strategic Growth Officer at GDSI
Location: Miami, Florida, United States 17 work roles 3 schools
1 work email found @intapp.com 4 phones found area 415, 650, and 401 LinkedIn matched
✓ Verified May 2026 4 data sources Profile completeness 100%

Contact Signals · 1 work email · 4 phones

Work email j****@intapp.com
Direct phone (415) ***-****
LinkedIn Profile matched
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Current company
Role
Strategic Growth Officer
Location
Miami, Florida, United States
Company size

Who is John Callahan? Overview

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Quick answer

John Callahan is listed as Strategic Growth Officer at GDSI, a company with 20 employees, based in Miami, Florida, United States. AeroLeads shows a work email signal at intapp.com, phone signal with area code 415, 650, 401, and a matched LinkedIn profile for John Callahan.

John Callahan previously worked as Vice President, Legal Sales at Herculesai and Chief Marketing Officer at Xpens.Ai. John Callahan holds Mseng, Name, Engineering from University Of Michigan.

Company email context

Email format at GDSI

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{first}.{last}@intapp.com
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AeroLeads found 1 current-domain work email signal for John Callahan. Compare company email patterns before reaching out.

Profile bio

About John Callahan

Having successfully guided companies like Aderant and Intapp through pivotal growth phases—including scaling revenue from $30M to $125M and leading IPO readiness—I thrive on identifying high-value market opportunities and crafting tailored go-to-market strategies to capitalize on them. Whether driving M&A, optimizing operations, or aligning organizational performance, my leadership delivers measurable impact for PE and VC-backed portfolio companies.I am a fractional CMO/CRO with over 25 years of experience in sales, marketing, and operations, with proven results and specialization in helping early- to growth-stage SaaS companies achieve scalable revenue growth and market prominence. Throughout my career, I’ve built high-performance teams that consistently exceed top- and bottom-line goals, delivering great results across FinTech, LegalTech, and SaaS industries.Highlights include:* Driving $125M revenue growth with 40% EBITDA at Aderant* Scaling Intapp through strategic growth to a successful IPO* Leading six M&A transactions in just eight monthsKey expertise includes:* Enterprise Sales Leadership* GTM & Corporate Strategy* Product-Market Fit* Fundraising & IPO Readiness* High-Performance Team DevelopmentLet’s discuss how I can help scale your business. Schedule a meeting here: calendly.com/jcallahan98/30min

Listed skills include Enterprise Software, Strategy, Professional Services, Start Ups, and 24 others.

Current workplace

John Callahan's current company

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GDSI
Gdsi
Strategic Growth Officer
Miami, FL, US
Website
Employees
20
AeroLeads page
17 roles

John Callahan work experience

A career timeline built from the work history available for this profile.

Strategic Growth Officer

Miami, FL, US

Vice President, Legal Sales

Current

Campbell, California, US

HerculesAI is a generative AI company that brings the power of large language models inside the security perimeter of enterprises. Its powerful operating and orchestration platform, Hercules, enables enterprises to quickly create, deploy, and run generative AI apps without compromising security standards. These apps can augment knowledge workers in any.

Dec 2024 - Present

Chief Marketing Officer

Current

Working with Founding Team to bring modern innovation in Finance Automation to Global Professional Services Markets. Helping to take the Company out of Stealth and launch an AI-augmented Finance Automation and Payments platform supporting the highly complex and heavily fragmented Professional Services markets world-wide.

Jan 2024 - Present

Strategic Growth Advisor, Mentor, Coach, Guest Speaker

Current
Various Start-Ups & Scale-Ups

Working with several early & mid-stage global technology enterprises at launch or at growth inflection points to strengthen and sharpen their GTM, Business Development & Revenue Generation to build foundations for significant growth. Supported Founders & Founding Teams in formation, fundraising, corporate governance, product/market fit, business.

Jan 2023 - Present

Planned Family Sabbatical

Proper Headspace

Relocate, Relax, Recharge & Refocus.

Jan 2021 - Jan 2023

Vice President, Global Head Of Finance Practice

Palo Alto, CA, US

Following GTM realignment, recruited by President to take Global GTM responsibility for Finance and Operations Practice. Realigned matrix organization of SME's, Pre-Sales, Value Engineering, CSM's, etc for revenue growth, higher client retention, heightened NPS and overall Business Unit expansion.

Jul 2019 - Jan 2021

Vice President, Sales - North American Large Firm & Asia Pacific Markets

Palo Alto, CA, US

Recruited by President to build high performing Go-To-Market teams responsible for rapid revenue growth in ACV with new logo and existing clients, with a broad platform of solutions, to Intapp’s premier markets. Expanded revenue visibility and accuracy as Intapp grew 4x from $50M to $200M ACV in run up to 2021 IPO. Responsible for negotiating and closing.

Jul 2015 - Jun 2019

Vice President, Americas

Milpitas, CA, US

Frontrange Solutions (today Ivanti), a Francisco Partners portfolio company, is a leading software developer of enterprise service management and unified endpoint management solutions.Recruited by Board and brought in based on expertise and prior success in building high performance cultures to turn around company and position it for sale. As member of.

May 2013 - Jul 2015

Vice President Sales, Americas

Atlanta, GA, US

  • Recruited back to the company by CEO to build a high performance sales organization and grow organic revenue as part of strategy to position company for sale. Leading a team of 30, provided vision, strategy and tactics.
  • Exceeded annual revenue goals year over year while growing revenues $22M to $45M.
  • Increased North American profitability by 40% in six short months.
  • Boosted corporate EBIDTA margins from 17% to 40%+.
  • Acquired and integrated six companies in eight months.
  • Facilitated significant value creation resulting in two equity exits to Vista Equity Partners (2008) and Madison Dearborn Partners (2012).
May 2008 - May 2013

Director, Large Firm Segment Marketing

Toronto, ON, CA

  • Recruited by COO based on expertise in business intelligence and analytics to launch a business intelligence BU from scratch and ramp revenues to give company a competitive foothold in a fast growth segment. Assessed.
  • Achieved 60% market share of the professional services organization (PSO) market.
  • Generated $10M in annual recurring revenue through strategic relationships.
  • Increased annual recurring maintenance revenues 50% year on year.
  • Created the foundation for what became a fast growth, highly profitable division of TR.
Feb 2005 - Apr 2008

Vice President Sales

Atlanta, GA, US

  • Transitioned from Solutions 6 after acquisition by Francisco Partners with mandate to sharpen focus on high yield, most profitable segments of the market. Led global sales and operations teams with $25M annual revenue.
  • Increased year over year revenue by 28%.
  • Grew sales margins through attaining list prices.
  • Reduced and optimized costs by 20%.
Aug 2004 - Jan 2005

Executive Vice President, Global Sales

Solution 6 Group
  • Transitioned from Keystone Solutions as member of global executive team to oversee global sales, marketing and business development of enterprise and professional software solutions, and contribute to corporate.
  • Reduced and optimized expenses by 30%.
  • Increased customer satisfaction by 20%.
May 2002 - Aug 2004

President, North America

Keystone Solutions Group
  • Recruited by CEO to provide strategic and growth-oriented leadership to more than 400 professional service organizations as part of strategy to penetrate and expand share of North American market with new and.
  • Coordinated regional integration in global merger with Solution 6.
  • Facilitated exit to acquisition by Solution 6
Mar 2000 - May 2002

Team Member

United States Sailing Team - Finn Class, Atlanta & Sydney Olympic Games

The US Sailing Team is aiming for gold at the Rio 2016 Olympic and Paralympic Games, and is proud to part of Team USA. The team is managed by US Sailing, the national governing body of the sport of sailing in the United States.

Jan 1997 - Dec 1999

Senior Director

Inforespond
May 1998 - Sep 1999

Senior Trader

San Ramon, CA, US

Jan 1991 - Jan 1997
Team & coworkers

Colleagues at GDSI

Other employees you can reach at gdsi.com. View company contacts for 20 employees →

3 education records

John Callahan education

Mseng, Name, Engineering

University Of Michigan

Bseng, Name, Engineering

University Of Michigan

Vista Equity Partners High Potential Leadership Program

Vista Equity Partners
FAQ

Frequently asked questions about John Callahan

Quick answers generated from the profile data available on this page.

What company does John Callahan work for?

John Callahan works for GDSI.

What is John Callahan's role at GDSI?

John Callahan is listed as Strategic Growth Officer at GDSI.

What is John Callahan's email address?

AeroLeads has found 1 work email signal at @intapp.com for John Callahan at GDSI.

What is John Callahan's phone number?

AeroLeads has found 4 phone signal(s) with area code 415, 650, 401 for John Callahan at GDSI.

Where is John Callahan based?

John Callahan is based in Miami, Florida, United States while working with GDSI.

What companies has John Callahan worked for?

John Callahan has worked for Gdsi, Herculesai, Xpens.Ai, Various Start-Ups & Scale-Ups, and Proper Headspace.

Who are John Callahan's colleagues at GDSI?

John Callahan's colleagues at GDSI include Noel Guido, Doug Graham, Michael R., Aptivos Sales, and Levi Donaldson.

How can I contact John Callahan?

You can use AeroLeads to view verified contact signals for John Callahan at GDSI, including work email, phone, and LinkedIn data when available.

What schools did John Callahan attend?

John Callahan holds Mseng, Name, Engineering from University Of Michigan.

What skills is John Callahan known for?

John Callahan is listed with skills including Enterprise Software, Strategy, Professional Services, Start Ups, Product Management, Saas, Business Development, and Business Intelligence.

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