Portfolio Manager - Who We Are - Jemstep

Trust Jemstep to help you achieve your retirement savings goals.

Proven approach

Based on Nobel Prize-winning economic research and patented technology, Jemstep makes it easy to manage your investments like an expert.

Private. Safe. Secure.

Jemstep employs bank-grade security to safeguard your information. As a read-only system, Jemstep can only view your information, and does not have access to make any changes.

Simple, Straightforward Advice

Saving for retirement shouldn’t be confusing or frustrating. At Jemstep, we’re committed to providing you with easy to understand advice and guidance that gives you the confidence you need to make smart investment decisions. The expertise and technology behind our advice is advanced, but we keep your action plan simple and straightforward.

Who we are

A privately owned, independent money management firm headquartered in Los Altos, CA, Jemstep is led by a team of experts with over 100 years of combined experience in finance, management, and technology innovation and development. Founded in 2008, Jemstep tracks more than 3 billion dollars in assets for private clients.

Executive team

Michael Blumenthal, Founder and Joint CEO

Michael brings to Jemstep two decades of experience as a senior executive and serial entrepreneur. Having founded his first business venture at age 17, he went on to build a successful career as a stockbroker at a large U.S. brokerage. Before taking up the reins as director and then CEO of the family business. In managing his family assets, he soon became disillusioned with the advice he was receiving from brokers and set about finding a way for ordinary people to get access to transparent, unbiased investment guidance tailored to their needs. Michael is also a partner in a property development and management company. Michael's vision of empowering ordinary investors to make better decisions for themselves led to his founding of Jemstep in 2008. Michael is responsible for the company's overall vision and strategy, and his passion for putting investors first continues to drive Jemstep's mission.

Michael Blumenthal

Founder and Joint CEO

Kevin Cimring, CEO

practiced as a corporate lawyer for several years, representing large public companies and multi-national businesses, before pursuing a successful career as an entrepreneur. Prior to settling in Silicon Valley to help establish Jemstep, he served as CEO and executive board member of several companies in financial services and technology with over 15 years experience in the wealth management industry. He holds Bachelor of Arts and Bachelor of Law degrees, in addition to his Series 65 certificate.

Kevin Cimring


Matthew Rennie, Chief Technology Officer

has a long record of achievement as a software developer and manager, completing major projects in the banking, insurance, and manufacturing sectors. His secure systems experience also includes a period of service as a project manager with Striata, a leading electronic payment and billing service provider. Matthew holds a Bachelor's degree in Information Technology with distinction from Bond University in Queensland, Australia, where he majored in software development. He lives in Silicon Valley and is studying towards his Masters in Software Engineering at Carnegie Mellon University.

Matthew Rennie

Chief Technology Officer

Simon Roy, President

has been involved as an investor, consultant, and chief executive officer in several successful Silicon Valley companies. He served as CEO of successful enterprise start-up Accrue Software, which was subsequently listed on NASDAQ. Before that, he acted as a senior consultant with McKinsey and Company for several years, serving financial institutions in New York. Simon earned his bachelor's degree in business science from the University of Cape Town and his M.B.A. in finance with distinction from The Wharton School of the University of Pennsylvania.

Simon Roy


Mark Richards, VP of Product

Mark has been an executive with numerous venture-backed Silicon Valley startups for the past 17 years. He co-founded NetMind, which sold to Intellisync (Nokia) for $800 million. Mark was also VP of Marketing for Aeroprise, which was acquired by BMC, and VP of Product Marketing at Intellisync. Most recently, Mark was with Sand Hill Partners, where he helped early-stage startups develop and market their products. Companies include Airespider (acquired by Ruckus Wireless), SliceRides, ZipDX, Convert.com, eKidsMovies, Kailea Networks, and iQor Technologies. Mark holds 3 software patents, and his work is featured in the book Nail It then Scale It by Furr and Ahlstrom. Mark holds a BSEE from University of Illinois, an MSEE from University of Arizona, and an MBA from San Jose State.

Mark Richards

VP of Product

Advisory Board

Dr. Jonathan Tiemann has some three decades of investment experience, including almost 10 years in academia and more than 15 managing money for institutions and individuals. He is the founder and president of Tiemann Investment Advisors, LLC, an investment management firm dedicated to bringing efficient, cost-effective, institutional-caliber investment management services to families and foundations. Before founding his own firm, Dr. Tiemann served as president and chief investment officer of BARRA RogersCasey Asset Services and chief investment officer for AdvisorTech Corporation. Prior to that, he was chief investment strategist (responsible for $180 billion in institutional assets) for Wells Fargo Nikko Investment Advisor/Barclays Global Investors. He writes and speaks frequently about the inner workings of his industry, often questioning behind-the-scenes practices common among brokers, advisors, traders, and fund managers and the failures of regulatory bodies to bring such practices to light. Dr. Tiemann holds a B.S. in applied mathematics from Yale University, an M.S. in operations research from Stanford University, and a Ph.D. in finance from Yale.

Prof. Terrance Odean the Rudd Family Foundation Professor of Finance at the Haas School of Business at the University of California, Berkeley, is a widely known and much honored expert on the financial industry and markets and a leader in the field of behavioral finance. Professor Odean has served on the editorial boards of numerous academic publications in his field, including the Journal of Finance and the Journal of Behavioral Finance, and has written widely on the psychology and behavior of traders and individual investors. He has also given scores of presentations at academic and professional conferences, and participated in more than 1000 television, radio, and print interviews and discussions. Professor Odean earned a B.S. in statistics at the University of California, Berkeley, and his M.S. and Ph.D. in finance at the Haas School of Business at the same institution.

Daniel Saksenberg with his wealth of experience building statistically-based models for predicting the effect of management action and other external factors on the performance and profitability of businesses and assessing the credit-worthiness of potential borrowers, has been closely involved in the validation and testing of Jemstep's algorithms. Mr. Saksenberg's clients include ministries of finance, insurance companies, banks, mining companies, manufacturers, attorneys, financial institutions, pension funds, and law enforcement agencies. He is a qualified actuary with a bachelor's degree in economic science from the University of the Witwatersrand in Johannesburg, South Africa, and a Fellow of the Faculty of Actuaries in Edinburgh, Scotland.

Dennis Troper has been working in hi-tech for over 17 years. He is currently a product management executive at Google, which he joined in 2003. At Google, Dennis leads product management for Google+ pages, where he is responsible for the development of product features and improvements related to brands and businesses on Google+. In previous years, Dennis has led a number of products both in the areas of AdWords and Google Apps and served as Google's regional product lead for Spanish Latin America. Prior to joining Google, Dennis has held product development and technology consulting positions at Oracle Corporation, Concur Technologies and Deloitte Consulting. He graduated with honors in Economics from the University of Texas at Austin and holds a MS in Applied Economics from UC Santa Cruz.

Selwyn Goldberg is a senior partner at Wilson Sonsini Goodrich & Rosati, the premier technology law firm in Silicon Valley with offices throughout the U.S. and Asia. Although his primary focus is on technology mergers and acquisitions, Mr. Goldberg's practice includes a wide range of intellectual property-related matters, including licensing, joint ventures, and technology transfers. His clients range from small start-up ventures to Fortune 100 companies such as Google, Cisco, and other top-tier Internet companies. Widely regarded as one of Silicon Valley's top technology lawyers, Mr. Goldberg was listed in the 2009 edition of Intellectual Asset Management 250 – The World's Leading IP Strategists, and named

Partners and Consultants

Windham Global Solutions. A division of Windham Capital Management. Windham Advisory Services is a consultative service dedicated to supporting the world’s most sophisticated investors including institutions and registered investment advisors (RIAs). Windham has established strategic research partnerships with many of the largest and most sophisticated institutional investors worldwide. Windham Global Services collaborated with the Jemstep investment team to develop the Portfolio Manager asset allocation and risk management tools.

CashEdge is the leading provider of payments and aggregation solutions to financial institutions, including the majority of the nations largest financial institutions , including Bank of America, Citibank, and Vanguard. The company gathers more than $4.5 billion in new assets each year for financial institution clients through its account opening and funding products and processes nearly $50 billion in online funds transfers annually.