Managing Director
Justin Singer
Justin is the Managing Director and Chair of the Investment Committee at Tortoise. He is also a Member of the firm and sits on Tortoise’s three-person Board of Managers. Justin graduated from Swarthmore College where he captained the men’s varsity tennis team. He also holds an MBA from New York University’s Stern Business School, with concentrations in Quantitative Finance and Financial Markets and Instruments.
Prior to joining Tortoise, Justin was a Portfolio Manager at Verition Fund Management, a multi-strategy hedge fund, where he ran the firm’s volatility trading business. Earlier in his career, he specialized in the pricing and trading of derivatives on a wide range of asset classes.
Chief Operating Officer
Riva Roloff
Riva is the Chief Operating Officer and a member of the Investment Committee at Tortoise. She is also a Member of the firm and sits on Tortoise’s three-person Board of Managers. Riva graduated from the University of Virginia, with a B.A. in Sociology. She received her law degree from Cornell Law School, magna cum laude and Order of the Coif.
Prior to joining Tortoise, Riva served for over 15 years as an Associate General Counsel and Vice President at Goldman, Sachs & Co. In her role, she covered a wide range of legal, regulatory, diligence and transactional responsibilities across various business lines. She also was a member of Goldman’s Banking Investment Committee and Structured Finance Capital Committee. Earlier in her career, Riva was a corporate lawyer at Simpson Thacher & Bartlett LLP.
Director of Client Service
Rochelle Yankwitt
Rochelle is a Member of the firm and sits on Tortoise’s three-person Board of Managers. She has held numerous roles at the firm since its founding. Rochelle graduated from Harvard College with an A.B. in Economics, cum laude in General Studies. She received her law degree from the University of Pennsylvania Law School, graduating first in her class, summa cum laude and Order of the Coif, and clerked for a U.S. federal judge on the U.S. District Court for the Southern District of Florida.
Rochelle also serves as a member of the Board of Directors of Gideon’s Promise, a non-profit public defender organization whose mission is to transform the criminal justice system by building a movement of public defenders who provide equal justice for marginalized communities.
Prior to joining Tortoise, Rochelle spent several years as a full-time parent, including homeschooling and managing the medical, behavioral, and emotional needs of her autistic child. She has frequently served as a Parent Representative on the Committee for Special Education for the White Plains City School District. Earlier in her career, Rochelle was a tax lawyer at Simpson Thacher & Bartlett LLP, as well as a Staff Attorney at the Children’s Law Center.
Director
Vicki Crisalli
Vicki is a Director and member of the Investment Committee at Tortoise. She graduated with a B.S. in Finance, cum laude, from the A. B. Freeman School of Business at Tulane University. Vicki holds the Certified Private Wealth Advisor® (CPWA) certification, administered by the Investments & Wealth Institute and taught in conjunction with The Yale School of Management. She is also a holder of the Chartered Financial Analyst (CFA) designation.
Prior to joining Tortoise, Vicki was a Senior Investment Strategist at the Wells Fargo Private Bank, where she oversaw client’s investment portfolios. She also served as a Senior Investor and Portfolio Manager for over 15 years at J.P. Morgan, where most recently she advised clients in the Private Bank’s Law Firm Group and served on the U.S. Portfolio Construction Committee.
Director
Brendan Blaney
Brendan is a Director and member of the Investment Committee at Tortoise. He is also a Member of the firm. Brendan graduated with a B.S. in Quantitative Economics, cum laude, from Tufts University. During his time at Tufts, Brendan was a four-year member of the cross country, indoor and outdoor track teams.
Brendan holds the Certified Private Wealth Advisor® (CPWA) certification, administered by the Investments & Wealth Institute and taught in conjunction with The University of Chicago Booth School of Business.
Director
Tessa Shore
Tessa is a Director and member of the Investment Committee at Tortoise. She is also a Member of the firm. Tessa received a B.S. in Quantitative Economics and International Relations, cum laude, from Tufts University.
Director
Andrea Turley
Andrea is a Director and member of the Investment Committee at Tortoise. She is also a Member of the firm. Andrea received a B.A. in Economics from Williams College. During her time at Williams, Andrea participated in Varsity Women’s Crew.
Andrea holds the Certified Private Wealth Advisor® (CPWA) certification, administered by the Investments & Wealth Institute and taught in conjunction with The University of Chicago Booth School of Business.
Senior Associate – Investments
Claire Brennan
Claire is an Associate Director and member of the Investment Committee at Tortoise. She is also a Member of the firm. She received a B.A. with departmental honors in Economics from Haverford College, with a concentration in Mathematical Economics. While at Haverford, Claire led a social skills group for children with Autism.
Claire holds the Certified Private Wealth Advisor® (CPWA) certification, administered by the Investments & Wealth Institute and taught in conjunction with The University of Chicago Booth School of Business.
Senior Associate – Investments
Michael DellaMedaglia
Michael is an Associate Director and member of the Investment Committee at Tortoise. He is also a Member of the firm. He received a B.A., with distinction in all subjects, in Economics from Cornell University, along with a minor in Business from Cornell’s Dyson School of Applied Economics and Management, and a minor in Real Estate from Cornell’s School of Hotel Administration. While at Cornell, Michael served as a student mentor working closely with Career Services and the Economics department.
He is also a holder of the Chartered Financial Analyst (CFA) designation.
Senior Associate
Paty Acipreste
Paty is an Associate Director and member of the Investment Committee at Tortoise. She received a B.S. in Financial Economics, a B.A. in Spanish, and a B.A. in Latin American Caribbean Studies with high honors, magna cum laude, from Binghamton University. While at Binghamton, Paty served as a student mentor, a Resident Assistant, and President of Newman House – The Catholic Church at Binghamton University.
Paty holds the CERTIFIED FINANCIAL PLANNER® certification administered by the Certified Financial Planner Board of Standards, Inc.
Associate
Jake Lambert
Jake is a senior associate at Tortoise responsible for portfolio management, research, and client relations. He received a B.S. in Finance, summa cum laude, from the University of Connecticut. While at UConn, Jake served as a mentor to first year honors students and as a Peer Advisor in the School of Business, helping students navigate course planning and degree requirements.
Jake holds the CERTIFIED FINANCIAL PLANNER® certification administered by the Certified Financial Planner Board of Standards, Inc.
Analyst
Andrew Barber
Andrew is an senior associate at Tortoise responsible for portfolio management, research, and client relations. He received a B.S. in Cognitive and Brain Sciences, summa cum laude, from Tufts University. While at Tufts, Andrew served as a lead analyst for Tufts Financial Group, which manages a student-run portfolio and teaches students about financial modeling and professional development within the finance industry. He was also the co-captain of the Tufts Club Water Polo team.
Analyst
Stevie Fitch
Stevie is an associate at Tortoise responsible for portfolio management, research, and client relations. He received a B.A. in Economics from Carleton College. While at Carleton, Stevie served as a student advisor and prefect in the Economics department. He also was a four-year member of the men’s varsity swimming team.
Brian Crane
Brian is an associate at Tortoise responsible for portfolio management, research, and client relations. He received a B.A. in Mathematics with a minor in Russian from Williams College. While at Williams, Brian worked as a Teaching Assistant for the math department and participated in trivia contests as a member of Sherlock’s Holmies.
Joey Rossetti
Joey is an associate at Tortoise responsible for portfolio management, research, and client relations. He received a B.A. in Economics and Statistics from Williams College. While at Williams, Joey captained the Varsity Wrestling Team.
Claudia Cantin
Claudia is an analyst at Tortoise responsible for portfolio management, research and client relations. She received a B.A. in Economics and a B.A. in Mathematics, cum laude, with a minor in French from Williams College. While at Williams, Claudia was a four-year member of the alpine ski team and served as a peer tutor.
Chris Rossetti
Chris is an analyst at Tortoise responsible for portfolio management, research and client relations. Chris received a B.S. in Quantitative Economics, summa cum laude, with a minor in Computer Science from Tufts University. While at Tufts, Chris was a member of the men’s club volleyball and baseball teams.
Oleh Shostak
Oleh is an analyst at Tortoise responsible for portfolio management, research, and client relations. He received a B.A. in Economics, with Honors, from Haverford College. While at Haverford, Oleh worked as a Research Assistant for the Economics and Computer Science departments and captained the Intramural Volleyball Team.
Director – Technology & Operations
Mike Mattern
Mike Mattern serves as the Chief Compliance Officer and Director – Technology & Operations at Tortoise. He has a B.S. in Economics from the University of Pennsylvania’s Wharton School. While at Penn, he was a four-year letter winner on the men’s varsity baseball team, earning awards as Rookie of the Year and Pitcher of the Year (twice).
Prior to joining Tortoise, Mike held analyst positions with The Vanguard Group, SEI Investment Management and SAC Capital Advisors.
Executive Assistant
Cathryn Hohwald
Cate serves as an Executive Assistant at Tortoise. She has a B.S. from the University of Hartford. Cate holds a fourth-degree black belt in Tae Kwon Do. Prior to joining Tortoise, she spent six years at the Exceptional Tae Kwon Do Center in White Plains where she was both an instructor and business manager.
Administrative Assistant
Marion Mann
Marion serves as an Administrative Assistant at Tortoise. Prior to joining Tortoise, she spent five years at a law firm that represented mortgage servicers, banks and investors where she supervised paralegals and legal assistants. Marion earned a B.A. in Elementary Education, summa cum laude, from Glassboro State College. She also has an A.S. Degree in Legal Assisting from Broward College. In addition, Marion has held various positions in the financial industry and legal field.