Professional Staff

Shannon Rigali, CPA

Shannon Rigali, CPA

Senior Manager

Shannon is originally from Chicago and she graduated from Lindenwood University in 2010. She began working for the firm as a tax season intern in January of 2011 and joined the Lenhart, Mason Team shortly after that tax season. Since that time, Shannon has gained a wide variety of tax and auditing experience for all matter of clientele. Out of the office, Shannon enjoys traveling, hiking, and watching Netflix with her dog, Dexter.

Melanie Urwiller, CPA

Melanie Urwiller, CPA

Senior Manager

Melanie was born and raised in Casper, Wyoming and attended the University of Wyoming, receiving her B.S. in Accounting in the Fall of 2012. Melanie was elated to return to Casper upon graduation to start with the firm as a tax intern in January of 2013. Fast forward several years, and Melanie is now an enthusiastic manager at the firm taking every opportunity presented to serve the firm, clients, and community. She enjoys serving on local nonprofit boards where she can pair her love and knowledge of accounting with her desire to see Casper flourish. Melanie is also proud to be a graduate of the AICPA Leadership Academy class of 2018 where she was able to network with other young CPAs from across the county while developing leadership skills to navigate the future of the accounting profession. Outside of the office, you can usually find Melanie crocheting or planning an adventure (usually food related) with her husband Alex!

Jake Bischoff, CPA

Jake Bischoff, CPA

Manager

Jake is from Lovell, Wyo and graduated from the University of Wyoming in the Spring 2014 with his B.S. in Accounting. In his free time he enjoys hunting, fishing, golfing and spending time with friends and family.

Kevin Taucher, CFE, CPA

Kevin Taucher, CFE, CPA

Manager

Kevin is from Rock Springs, Wyoming and is a recent graduate of the University of Wyoming. He received a B.S. in Accounting in fall of 2011 and an M.S. in Accounting in the spring of 2013. In his free time he enjoys spending time with friends and family as well as attending University of Wyoming athletic events.

Libby Jackson

Libby Jackson

Manager

Libby was born in Steamboat Springs, CO, and grew up on a working cattle ranch west of Steamboat Springs. While growing up, Libby spent many hours helping her family care for cattle and horses and has a great love for the ranching way of life. Libby received her B.S. in Accounting in 2012 and M.S. in Accounting in 2013 from the University of Wyoming, as well as a Minor in Agricultural Business in 2012. After graduating from college, Libby worked in public accounting for firms in Fort Worth, TX and Denver, CO before returning to Wyoming and joining Lenhart Mason & Associates LLC in 2022 as a remote manager. Libby enjoys assisting clients with their tax and wealth transition planning needs and works with clients across various industries, including agriculture, construction, and professional services. Libby and her husband Scott live in Pinedale, WY, and spend as much time as possible outside riding horses, camping, hanging out on the lake, skiing, and snowmobiling. Libby also enjoys reading and spending time with her family and friends.

Michaela Anderson, CPA

Michaela Anderson, CPA

Senior Accountant
John Conner, CPA

John Conner, CPA

Senior Accountant

John is originally from Marion, IA. He graduated from Coe College in Cedar Rapids, IA in 2016 with a B.A. in Accounting and completed his M.A. at the University of Iowa in the spring of 2017. John spends the majority of his free time outdoors including hunting, fishing, and snowboarding.

Michael Curtis, CPA

Michael Curtis, CPA

Senior Accountant
Katelyn Olson, CPA

Katelyn Olson, CPA

Senior Accountant

Katelyn is a Wyoming native and graduated from the University of Wyoming in 2018 with her B.S. in Accounting and her B.S. in Agricultural Business. She interned with LMA and then started full time upon graduation. She received her CPA license in August of 2020. She is continuing to gain experience with a variety of tax and assurance clients. Outside of work she enjoys spending time with friends and family, traveling, gardening, and most other outdoor activities.

Whitney Wollman

Whitney Wollman

Senior Accountant


Kaylee Bond

Kaylee Bond

Staff Accountant

Kaylee is from Riverton, Wyoming. She graduated from the University of Wyoming in 2021 with B.S. degrees in Accounting and Business Management with a concentration in Human Resources. She started at LMA as a remote tax season intern and began full time after graduation. She currently lives in Casper with her cats, Tawny and Turbo.

Melanie Dowler

Melanie Dowler

Staff Accountant
Justine Martinez

Justine Martinez

Staff Accountant

Originally from Gillette, Wyoming, Justine joined the firm in 2021. She received her B.S. degrees in Accounting and Management of Human Resources from the University of Wyoming. She was drawn to LMA for the family-oriented culture and rewarding career opportunities. When she’s not studying for the CPA exams, she enjoys true crime documentaries and podcasts.

Brentyn Shaffer

Brentyn Shaffer

Staff Accountant

Accounting Specialists

Rhett Reyes

Rhett Reyes

Accounting Services Manager

Rhett Reyes previously worked many years as an accounting specialist and staff accountant. He completed his bachelor’s degree in business administration/accounting CPA path from Chadron State College in 2020. He has extensive knowledge in the areas of payroll, day to day bookkeeping operations, and QuickBooks procedures and setup. He also believes that building strong associations with each client is essential and fulfilling. Rhett is married (Amber) and has two daughters he is so very proud of. His family enjoys travelling and make a regular trip to the beach and the mountains every summer. The Reyes’, including two boxers named Rocky and Ripley, live in Paradise Valley.

Angie Bailly

Angie Bailly

Accounting Specialist

Angie is an Accounting Specialist at Lenhart, Mason & Associates. She performs various bookkeeping duties including payroll and monthly service. She grew up in Casper, WY and in December of 2018 earned her Associates Degree in Accounting from Casper College. She is currently in the process of finishing her Bachelor’s Degree in Accounting. In her spare time she enjoys taking walks, crocheting, reading, and spending time with her friends and two dogs; Lola and Thor.

Shirley Costopoulos

Shirley Costopoulos

Accounting Specialist

Shirley started working for the firm in January 1990 in the accounting specialist department. She fell in love with bookkeeping in her senior year of high school. Shirley enjoys working with clients performing monthly write-up work, preparing financial statements, processing payroll and payroll reporting, and providing accounting software support.

Angela Erickson

Angela Erickson

Accounting Specialist

Angela is an Accounting Specialist at Lenhart, Mason & Associates. She performs various duties including payroll, monthly bookkeeping, and QuickBooks training and support. She grew up in western Montana. In May of 2006, she earned her Bachelor of Science degree in Accounting with a minor in Banking and Finance from Dickinson State University. Angela joined the firm in November of 2009, from Montana where she previously worked at Flathead Bank in Bigfork, MT. In her spare time, she participates on a bowling and softball league, enjoys camping, hiking, and walking her two dogs Harley and Jasper.

Terry Grannan

Terry Grannan

Accounting Specialist

Terry began working at the firm in July 2007 as an Accounting Specialist. Prior to joining the firm, Terry and her husband, Rolly, owned and operated a US Mail contracting business for 20 years in Flagstaff, AZ. She currently performs duties of monthly bookkeeping for a wide variety of clients; payroll, compilations, and QuickBooks assistance are also part of her duties. Terry is a Certified QuickBooks Pro Advisor, and welcomes the challenges of problem solving for her clients. She is a member of the American Institute of Professional Bookkeepers and earned her Bachelor’s Degree in Economics. Terry is currently serving as Treasurer for the Reach 4 A Star Riding Academy; she volunteers in various capacities at the arena, and at the Natrona County Library. Terry has two grown daughters, and enjoys reading, hiking, ranching and gardening, cooking, and spending time with her friends and dogs.

Mehdia Wurtz

Mehdia Wurtz

Accounting Specialist

Administrative Assistants

Daena Caldwell

Daena Caldwell

Administrative Assistant
Lindsey Ford

Lindsey Ford

Administrative Assistant

Lindsey was born and raised in Casper with a large extended family. She stayed in Casper to complete her Associates in Communication from Casper College; and then moved to Laramie where she received her Bachelors in Communication with interests in advertising and marketing. After college she worked a variety of jobs from retail to health care administration before coming to Lenhart, Mason & Associates.

Juanita Jungck

Juanita Jungck

Administrative Assistant

Juanita grew up in southwest Colorado and moved to Wyoming in 1990. She has a BS degree in Business Administration/Emphasis in Management from Regis University in Denver, as well as a Culinary Arts degree from Le Cordon Bleu. When not at work, Juanita enjoys spending time with family and friends, as well as a variety of hobbies.

Shannon Ketterling

Shannon Ketterling

Administrative Assistant

Shannon is originally from Laurel MT and has lived in Casper since 2007. She greatly enjoys the accounting field, and before moving here had been employed with a long standing accounting firm in Billings MT. Out of the office, Shannon enjoys all motor sports, camping in the mountains, four-wheeling, and spending time with her kids, grandkids and poodles.

Lyn Shipman

Lyn Shipman

Administrative Assistant

Lyn was born and raised in Casper. After graduating high school, she ventured to Long Beach Community College and California State University in southern California where she obtained an AA degree. She then transferred to the University of Wyoming to obtain a BA in Elementary Education. She taught in the NCSD for 5 years then worked in 2 different accounting firms in the area as an administrative assistant and later in human resources. She the took her HR experience into the medical field for 8 years, returning to LMA as an administrative assistant. Lyn and her husband Scott have raised 3 boys and enjoys their new granddaughter. Hobbies and interests include camping, boating, 4-wheeling and a variety of other hobbies.

Nicole Simmons

Nicole Simmons

Firm Administrator

Born and raised in Casper, Nicole graduated in 2002 from Casper College with an A.S. in Computer Science and then from the University of Wyoming in 2005 with a B.S. in Management Information Systems and a minor in Business Administration. After working for a smaller locally owned company for over 8 years, Nicole joined our team in 2014 as Firm Administrator. In addition to helping manage our day-to-day business, Nicole is in charge of overseeing our firm’s financial statements, in-house payroll, benefit and retirement plan administration, and other HR duties, as well as any of our IT issues that arise. She is a member of the CPA Firm Managers Association. In her free time, Nicole spends time with her two little boys. Her main hobbies and passions include photography, shooting, and Taekwon-Do.

Retired

Jack Lenhart, CPA

Jack Lenhart, CPA

Retired

Jack attended the University of Wyoming and earned his bachelor’s degree in accounting in 1973. With over 30 years of tax, accounting and consulting experience in individual, partnership, corporation, fiduciary and estate taxation arenas, Jack has a diverse client base spanning various industries including ranching, oil & gas, construction, retail and restaurants. Jack prides himself on an ability to complete work timely and efficiently while looking after the client’s best interest. Jack is an active AICPA and Wyoming Society of CPAs member. He was also the past member and chairman of the Wyoming State Board of CPAs, an Eastern Wyoming College Distinguished Alumnus and a past board member of the Wyoming Cowboy Joe Club. A Lingle, WY native, Jack enjoys spending time with his family, fishing, and following the UW Cowboys. Jack and his wife Betty have three children: Melissa, Jennifer and Justin.

Rick Mason, CPA

Rick Mason, CPA

Retired

Rick completed his education at the University of Wyoming with honors in 1976. Since graduating from the University, Rick has been with the current firm or its predecessor, giving him over 30 years of experience in public accounting. Rick works with a variety of individual and business clients providing income tax preparation and planning services. He has a specific expertise in oil and gas taxation and real estate activities. Rick has served on many local boards over the years and is a current member of Rotary and treasurer of the Casper Rotary Foundation. He is also a director of the Myra Fox Skelton Foundation and a member of the University of Wyoming Foundation Planned Giving Advisory Council. Rick is a past president of the Wyoming Society of CPAs and past chair of the Wyoming Board of CPAs Rick and his wife, Betty, are avid golfers and enjoy traveling.