Growth, marketing & Sales ConsultantCY


helping clients achieve their objectives since 2013

Founded in 2013 by Jessica del Pilar, Isthmian Group is a woman-owned business based in St. Louis, Missouri with clients nationwide. 

During the first decade of her career, Jessica served as special assistant to Fareed Zakaria at CNN & Newsweek, Director of Development for PEI Architects in New York City, helped found the DC office of Fentress Architects, and authored five books. 


Isthmian Advisors have extensive experience providing pragmatic, compelling and innovative strategies to achieve a wide range of growth, marketing & sales objectives.

client roi

YoY Growth


Years of Experience


Happy Clients


We ensure clients can both percieve and quantify the benefits of our efforts by readily engaging in goal setting, monitoring & reporting.

We begin by seeking to understand the full context of each objective, and clearly defining what success will look like. We also utilize data—both internal and industry-specific—to further uncover insights of consequence.  

The products of discovery inform the next step: development of pragmatic, compelling and innovative strategies, processes, content and more. The development of options is essential, and aids the decision making process.

We are meticulous and methodical, and we are also adaptable. We focus on details, and we never lose sight of the big picture. In concert with our clients, we set deadlines for each milestone to ensure we deliver on time and budget.


We bring deep industry experience to every consulting engagement we undertake.

Growth Strategy

Data, Analytics & Insights

Market Expansion

Return on Investment Analysis

Increase Valuation & Exit Planning

Merger & Acquisition Planning

Marketing Strategy

Market Positioning & Brand Development

Demand & Lead Generation

Integrated & Content Marketing

Social Media & Website Optimization

Graphic Design

Customer Experience & Loyalty Programs

Sales Strategy

Go-to-Market Plans & Launches

Operating Model & Structure Optimization

Sales Role & Talent Strategy

Sales Performance & Productivity

Sales Management & Operations


Jessica is a highly self-motivated and enthusiastic partner. Her skills and discipline have helped us achieve a wide variety of goals and objectives.

CUrtis worth fentress, FAIA  |  founder, fentress architects

Jessica del Pilar organized my life with an efficiency and intelligence that I could never match and a grace that I don’t possess.

Fareed Zakaria  |  Author & Host of CNN’s Fareed Zakaria GPS
Current & recent clients

Since 2013, Isthmian has been retained by more than 15 clients, in a variety of industries, all on multi-year contracts.

Fareed Zakaria logoTalent by 360 logoNavigate Building Solutions logoCNN logo
Fentress Architects logoPatterhn Ives logoThe Little MBA logoWarson Woods Family Dentistry logo

We look forward to hearing from you.

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