About Sterling

“To professionally and efficiently protect and advocate for those in need.”

In life, there are moments when knowing who to turn to makes all the difference. It’s in these moments, our fears and uncertainties leave us feeling the most vulnerable. This is especially true, when our feelings are driven by the need to protect someone we love.

You see, coming alongside someone in their time of need is a tremendous gift. It can be a listening ear or a word of comfort. Sometimes it’s helping to answer the tough questions or offering guidance when the world seems dark. But the truth is, it can even be the voice of reason. This can be a source of comfort when making the tough but necessary decisions.

At Sterling Case Management & Fiduciaries of Arizona, we understand the opportunity we hold to make a difference in someone’s life. It’s why, with a servant’s heart our focus is on serving others. Quite simply, every decision, every touch-point we make is illustrated with dignity and compassion.

We begin with our gift for listening, a kindness you’ll feel right from the start. You see, we’re interested in what’s on your heart as much as what’s on your mind. It’s all part of our commitment to doing what’s best for you.

In many ways, at Sterling Case Management & Fiduciaries of Arizona we plant seeds of hope and comfort. What grows is good faith, loyalty and trust. A great way to be a blessing in someone’s life.

Meet Us

Martelle Olsen

President & Fiduciary

Martelle is a licensed Fiduciary (#20735).   She has Masters’ Certificate in Gerontology and an undergraduate degree in Public Administration, Health & Human Services. During her university tenure, she became passionate about the importance of providing quality Fiduciary and Case Management oversight for the elderly, the mentally ill and individuals with special needs.

She was born in Logan, Utah and lived a portion of her formative years in Durban, South Africa. Her family moved to Tucson during her High School years and since then, she has considered Tucson her home. Martelle and her four children enjoy exploring National Parks and practicing Tae Kwon Do.  She earned her first degree black belt in October 2018.

“Be kind whenever possible. It is always possible.” 

Dalai Lama

Ruth Georgina Covey

Vice President, Operations & Fiduciary

Ruth is a licensed Fiduciary (#20854).  She has an extensive operations and corporate leadership background with companies such as Raytheon, Boeing and Applied Materials.  Included in her core strengths are process development and enhancement, quality management systems, security and customer satisfaction.  Ruth has an International Management Masters’ degree and an undergraduate degree in Manufacturing Engineering. 

Currently she is member of the Caregiver Training Institute Board of Directors.  Additionally she is the founder of Arizona Magic of Music & Dance, a non-profit theater program for individuals with physical and cognitive disabilities and co-founder of Women’s Safety & Leadership Training, a non-profit program to train, motivate and mentor women of all backgrounds and ages to be formidable opponents and committed leaders.

She is a US Citizen, born in the United Kingdom and reared in the Republic of South Africa. Ruth has three children.

“The main thing, is to keep the main thing the main thing.”

Steven Covey

Andy Latherow

Director Client Finance & Fiduciary

Andy is a Licensed Fiduciary (#20866) and the Director of Client Finance. He who developed his unique competences over twenty-three years of working with people to achieve personal improvement, self-defense capabilities and life skills development.

Andy has an undergraduate degree in Psychology. Over the years, he developed an awareness and passion for the role of guardianship for the elderly, mentally ill, and those with special needs.

He was born in Cocoa Beach, Florida and moved to Tucson, Arizona in 2010.

“What you do today can improve all your tomorrows.”

Ralph Marston

Tamara Varga

Sr. Case Manager & Fiduciary

Tamara is a licensed fiduciary (#20860). She has developed her versatility and skills as a fiduciary and case manager from her time as a support coordinator at the Division of Developmental Disabilities (DDD) and as a fiduciary at the Pima County Public Fiduciary’s Office. She has also worked in pharmacy and real estate.

Tamara has a Bachelors’ Degree in Nutritional Science from the University of Arizona. She spent her childhood in Santee, California and moved to Tucson when she was 12 years old. Tamara and her husband Jeffrey have three children.

Tamara became passionate about helping individuals with Special Needs after having a son diagnosed with autism and a son with Down Syndrome. She has a unique perspective as an individual who is a parent/caregiver of two sons with special needs, someone who has worked as a support coordinator with DDD, and as someone who advocates and mentors those with Special Needs as a fiduciary and case manager.   

“We must teach our children to dream with their eyes open.” 

Harry Edwards

Adilene Rabago

Sr. Case Manager & Fiduciary

Adilene is a licensed fiduciary (#20872). She has a great passion for advocating and assisting individuals in need. She acquired her multifaceted skills and experience as a fiduciary for the Pima County Public Fiduciary office and case manager for the Division of Developmental Disabilities. Adilene was born and raised in Tucson, AZ and graduated from the University of Arizona with a bachelor’s degree in Psychology. She is a strong advocate for the elderly and special needs population and is determined to improve the quality of life for the individuals she serves.

Dominique Magallnes

Sr. Case Manager

As a Senior Case Manager, Dom dedicates himself to working with clients to ensure their needs are met. Dom brings to Sterling a team player attitude, animated personality, and approximately five years of Behavioral Health Case Management and Non-profit experience. His approach to working with clients consists of active listening, compassion, and advocacy.

Dom is originally from California and relocated to Tucson, Arizona in 2018 to broaden his horizons. He attended Bakersfield Community College and obtained his Bachelor’s Degree in Psychology from National University. Dom speaks both English and Spanish fluently. When Dom isn’t working with clients, you can usually find him at home with his three cats, playing video games, or singing Karaoke around town.

“When the world is silent, even one voice becomes powerful.” 

Malala Yousafzai

Sandy Hawkins

Client Account

Sandy is the Client Accountant and comes to Sterling with forty years of bookkeeping experience. She holds an Associate degree in Accounting. Her skills have benefited others as she spent twenty-three years working in the oil field industry in Ohio and another eleven years in County Government as a bookkeeper, payroll manager and HR Specialist managing three departments.  At Sterling, Sandy maintains client’s financial accounts to provide them the best possible care.

Sandy is originally from Holmes Co., Ohio. She moved to Arizona in 2011, finally settling in Tucson in 2014.  She enjoys a variety of activities such as quilting, faceting, and prospecting. She also enjoys traveling and the company of her two dogs, Anna and Cooper.

“Live your beliefs and you can turn the world around.” 

Henry David Thoreau

Tracy Walker

Administrative Assistant

As Sterling Case Management’s Administrative Assistant, Tracy is responsible for the scheduling, payroll, and general well-being of the caregivers.  She is also responsible for the day-to-day office administrative duties and making sure the office runs smoothly so the case managers can focus on their work for the clients.

Tracy studied at Wichita State University and was a legal assistant for 10 years.  She is also a licensed aesthetician graduating from Pure Aesthetics Natural Skin Care School.

Tracy has lived in Tucson 8 years and likes to spend her free time with her two children and 3 fur babies.  She enjoys art, reading, going to the movies, and hiking.

“Kindness in words creates Confidence.  Kindness in thinking creates Profoundness.  Kindness in giving creates Love.” 

Lao Tzu

Stacy DeLancey-DeLeon

Client Bookkeeper

Stacy is Sterling’s Client Bookkeeper and is an apprentice Fiduciary. She has a Bachelors’ degree in Accounting and College Reading & Learning Association (CRLA) Tutor Certifications. Stacy handles client bill payment and is the Veterans Administration (VA) liaison.

Stacy lives in Tucson with her husband and son. She enjoys spending time with her granddaughter, doing needlework and is an active member of her church.

Yvonne Valdez


Yvonne D. Valdez is a rare Tucson Native.  She has worked in the legal and fiduciary field for over twenty years.  Her vast knowledge makes her a great first point of contact for Sterling.  She enjoys talking to and taking care of the Sterling clients, scheduling appointments and answering questions.  She is the proud mother of three sons, Frank, Raymond and Steven. Yvonne also spends lots of her spare time with her mother, father and large extended family. We are pretty sure Yvonne is related to almost everyone in Tucson.  Outside of the office she loves the outdoors, gardening and dancing.  She is a passionate dog lover and enjoys her Maltipoo Sasha.

“The 3 C’s in life:  Choice, Chance, Change.  You must make the Choice, to take the Chance, if you want anything in life to Change.”