P Value Partners

Jason MacRae delivers growth at the intersection of e-commerce, financial services and data science.

Jason was previously Chief Data Officer, Investment Research and Management at Capital Group, leading a team responsible for AI and software systems that support investment research and portfolio management across $2 trillion of assets under management. Previously, Jason served as Director of Research Science at Amazon, where he led the largest AI/ML team in the firm's flagship Marketplace division, responsible for building automated production systems that solved a range of hard prediction problems at scale.

Jason has built, operated, and led several successful risk-based businesses whose competitive advantage was based on proprietary data and models. He was General Manager of Amazon Lending, the Amazon business unit that provides financing solutions to Amazon customers and suppliers globally. He also ran SunPower Financial, a captive finance company focused on residential solar. Under his leadership, both businesses were consistently profitable while achieving annualized growth rates exceeding 30%.

Earlier in his career, he was Morgan Stanley's Global Co-Head of Credit Solutions, responsible for the origination and execution of strategic private credit and asset finance transactions in Europe, the Middle East, and Asia. In addition to founding P Value Partners, Jason is the co-founder and Partner of Rohati Capital, an AI-focused venture capital fund-of-funds based in Palo Alto, California. Jason holds a bachelor's degree in physics, cum laude, from Harvard University.

Stefan Haney drives revenue growth, cost transformation, and AI-enabled platform modernization across e-commerce, healthcare, and enterprise software.

Stefan spent 15 years at Amazon, most recently as a Director on the Consumer Shopping leadership team, where his teams launched AI-powered features generating over $8B in incremental revenue. He then co-founded Foundry Brands, a $100M private-equity-backed e-commerce platform that grew revenue more than 20% annually. He went on to serve as SVP of Growth Technology at Honor — the largest in-home care platform in the United States — where he architected an LLM-powered platform that transformed sales and customer care and led IT cost reductions through platform consolidation.

Stefan is named on 11 patents in marketplace, pricing, and cross-border trade.

Kosar Jaff drives high-impact technology transformation, AI innovation, and platform architecture across enterprise software, e-commerce, and industrial technology.

Kosar was previously Vice President of Engineering at Shopify, where he built and deployed machine-learning and expert systems to combat fraud and safeguard platform trust across millions of merchants. Prior to Shopify, he served as Vice President of Data Platform & AI at Accolade, leading a 55-person data science and analytics organization through the company’s IPO. At Amazon, Kosar served as Director of Software Development, leading the launch of Amazon Spark, building the global Amazon Fashion engineering team from 5 to over 140 engineers, and re-engineering the core Amazon Mobile Shopping platform serving tens of millions of users. Most recently, Kosar designed and deployed production-grade, agentic AI stacks on Databricks and edge environments, combining real-time DSP, custom multi-tenant RAG pipelines, and specialized on-device signal processing algorithms for industrial IoT and mobile platforms.

Earlier in his career, Kosar held engineering leadership roles at Google—building VoIP, real-time index processing, and advertising infrastructure—as well as Microsoft and Intel, where he contributed to foundational hardware-software standards including the co-development of USB.

Kosar holds an MBA from California State University, a BSc in Electrical & Computer Engineering (Honors) from North Carolina State University, and is an inventor on 8 issued patents.

Ellen Kinney builds AI-powered products and services that drive revenue and reduce costs across technology, retail, financial services and energy companies.

At Amazon, she served as General Manager of the global consumer installments business and Amazon Capital Services, and held leadership roles within Worldwide Prime. In those roles, she managed the P&L, driving growth and profitability while building product, operations, and risk teams that leveraged technology to scale. At SunPower, she served as SVP of Digital Product and CMO, leading the product management team that drove the strategic software roadmap across sales, operations, and enterprise functions.

Earlier, she held senior marketing and analytics roles at Barclays Bank UK, Chase, and Starbucks; and began her career in investment banking at Credit Suisse.

Jamie Lomas helps brands, agencies, and technology companies accelerate growth by building world-class revenue organizations, retail media strategies, and high-performance operating models.

Jamie spent 14 years at Amazon, where he helped build Amazon's advertising business into one of the largest media platforms in the world. As a senior Amazon executive, he led organizations of thousands of employees and was responsible for multi-billion-dollar revenue businesses. During his highest-performing year, Jamie exceeded an $11 billion annual revenue target by delivering more than $13 billion in annual revenue while helping shape Amazon Advertising's growth strategy, enterprise sales organization, and customer success model.

Today Jamie advises agencies, technology companies, retailers, and private equity-backed businesses on revenue strategy, AI adoption, retail media, sales transformation, organizational design, compensation planning, and executive leadership. His work combines decades of operational experience with practical execution, helping companies scale faster while building durable competitive advantages.

Garth Mader builds and turns around technology businesses as a P&L owner, CEO, founder and advisor.

Garth spent 13 years at Amazon, holding GM roles across Apparel, which he grew to $3.4B by 2016, and Mobile Electronics, before becoming CEO of Amazon-acquired Woot. He led the technology and operations overhaul integrating Woot onto Amazon's platform, growing revenue from $250M to $500M ARR in three years, with a plan to reach $1B by year five. He also served as CEO of Trade Coffee, replatforming the business onto Shopify in just five months, built to drive engagement and retention.

Garth also built two companies from the ground up: Para Home Services, a concierge home services business that envisioned using a digital twin to manage systems and maintenance, and unreFIND, an AI-powered clean food shopping platform.