David Mandell

Co-Founder, General Partner, Massive: Investing in category-leading companies at commercial inflection points across inevitable deep tech markets

📍 Boulder, Colorado, United States🔄 Updated September 2026💼 3 investments📅 9 years investing🗓 Last invested Jul 2019𝕏 @upgrade_to_unlock
VC🌍 United States
3
Total investments
2
Early stage
0
Mid stage
0
Late stage
9y
Years active

Portfolio

2 investments · sorted by recency
All investments
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Mid stage
Late stage
Board Member
Apr 2019
Where teams go to find coworking spaces. Upsuite has created a service that helps leaders of growing companies find and secure coworking and flexible offices in an average of 23 days from the first call and with 90% less research and touring time. The company has assembled offices in nearly 2,000 locations throughout North America and has partnered with some of the world’s s best accelerators, commercial real estate pros, and business organizations to deliver them. Upsuite provides the easiest way to find, evaluate, and secure the coworking/flex office at the location, price point, and terms that teams want. Upsuite removes surprises and saves users time in their search by providing 99% of the market inventory, actual suite availability and pricing, all before they tour. If teams book through Upsuite, their membership also comes with exclusive discounts, and a 100% satisfaction guarantee. Verified coworking operator partners receive a stream of pre-qualified introductions, the ability to pick from interested companies who will provide the most revenue long term, delivered as a no-risk, no upfront cost on-demand service. Commercial real estate advisors/brokers work with Upsuite Coworking Advisors who help identify the ideal space for their clients and help close small or complex coworking deals. Upsuite Verified Operator Partners gain access to a steady stream of the most interested companies and corporate teams, all at no risk or upfront cost. Working with Upsuite maximizes their revenue, minimizes their sales and marketing risk, and ensures that they will have the kind of profitable members who will help their coworking business thrive. Commercial real estate advisors utilize Upsuite’s network of Coworking Operators to help find short-term coworking space for their clients in 90% less time that going direct.
Board Member
Jun 2017
Local agencies are a crucial segment of the child care industry. Our goal is to help agency owners save time and stay competitive by automating their temporary care operations and giving their customers the technology they expect with the Sitter Pro platform. Tasks like caregiver scheduling and processing payments that used to take days, take minutes with Sitter Pro. Now, agency owners can spend their time growing their business, not managing it. Sitter Pro consists of iPhone and Android apps for clients and caregivers in addition to a full back-end management system for the agency to oversee their operations. A few of the features: -Automated caregiver scheduling and assignment based on a proprietary algorithm that takes into account family favorites and agency recommendations -Time tracking -Automated payment processing supporting credit cards, cash, or invoices -Corporate backup care support -Supports any in-home care type including child, pet, senior, home, and tutoring. -Supports almost any business model with custom rate management and policy configuration including cancellation fees, minimum hours, and last-minute booking fees -Multiple service area support -Business reporting
Experience · 11 entries
All (11)
Investments (3)
Founder (4)
Board (3)
2020
Partner
Sep 2020
Global pre-seed fund backed by 500 founders and operators.
Co-Founder, Managing Director
Jan 2020
Access to the experience and insight of seasoned founders and executives is one of the most valuable resources a founder can have when growing a business. Using deal-by-deal investments, Massive connects startup founders with a curated syndicate who knows what it feels like to be an early stage CEO or co-founder, can add real, experience-based value, and want access to vetted venture deals through an approachable investment vehicle. Massive energizes the startup ecosystem and provides real founder advantages with an investment syndicate that combines their experience and capital to create real, measurable, financial and growth benefits.
2019
Board Member
Jul 2019
Vision: Prevention + Intervention in the Fight Against Child Abuse Mission Statement: We facilitate a collaborative approach to child abuse investigations while providing child victims and their families with support in a safe and child-focused environment. We strive to make the community safer for all children and families through intervention, education and advocacy.
Board Member
Apr 2019
Where teams go to find coworking spaces. Upsuite has created a service that helps leaders of growing companies find and secure coworking and flexible offices in an average of 23 days from the first call and with 90% less research and touring time. The company has assembled offices in nearly 2,000 locations throughout North America and has partnered with some of the world’s s best accelerators, commercial real estate pros, and business organizations to deliver them. Upsuite provides the easiest way to find, evaluate, and secure the coworking/flex office at the location, price point, and terms that teams want. Upsuite removes surprises and saves users time in their search by providing 99% of the market inventory, actual suite availability and pricing, all before they tour. If teams book through Upsuite, their membership also comes with exclusive discounts, and a 100% satisfaction guarantee. Verified coworking operator partners receive a stream of pre-qualified introductions, the ability to pick from interested companies who will provide the most revenue long term, delivered as a no-risk, no upfront cost on-demand service. Commercial real estate advisors/brokers work with Upsuite Coworking Advisors who help identify the ideal space for their clients and help close small or complex coworking deals. Upsuite Verified Operator Partners gain access to a steady stream of the most interested companies and corporate teams, all at no risk or upfront cost. Working with Upsuite maximizes their revenue, minimizes their sales and marketing risk, and ensures that they will have the kind of profitable members who will help their coworking business thrive. Commercial real estate advisors utilize Upsuite’s network of Coworking Operators to help find short-term coworking space for their clients in 90% less time that going direct.
2017
Board Member
Jun 2017
Local agencies are a crucial segment of the child care industry. Our goal is to help agency owners save time and stay competitive by automating their temporary care operations and giving their customers the technology they expect with the Sitter Pro platform. Tasks like caregiver scheduling and processing payments that used to take days, take minutes with Sitter Pro. Now, agency owners can spend their time growing their business, not managing it. Sitter Pro consists of iPhone and Android apps for clients and caregivers in addition to a full back-end management system for the agency to oversee their operations. A few of the features: -Automated caregiver scheduling and assignment based on a proprietary algorithm that takes into account family favorites and agency recommendations -Time tracking -Automated payment processing supporting credit cards, cash, or invoices -Corporate backup care support -Supports any in-home care type including child, pet, senior, home, and tutoring. -Supports almost any business model with custom rate management and policy configuration including cancellation fees, minimum hours, and last-minute booking fees -Multiple service area support -Business reporting
Show all 11 entries ↓
Investment activity
2017–2019 · 3 investments
2017120192
Recent (last 2 years)Earlier