Blogger Profiles


Meet the calf experts who contribute content to our blog. From University researchers to industry employed calf specialists, they have a wealth of knowledge to share. Submit questions through the Support page.

Dr. Bob James

Dr. Bob James

Dr. Bob James is a world renowned calf expert, highly-sought consultant and lead blogger. He is a Professor Emeritus of Dairy Science in the Dept. of Dairy Science at Virginia Tech. You’ve likely seen him speaking at industry events, including World Dairy Expo, Western Dairy Management Conference and World Ag Expo. His practical calf raising experience helps bridge research ideas into practical farm application.

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Dr. Adam Geiger

Adam Geiger was raised on a dairy farm in Wisconsin. He received his B.S. from the University of Wisconsin-Madison in Dairy Science. Upon graduation, he completed a M.S. degree at Mississippi State University in Ruminant Nutrition (Focus: Heat Stress, Transition Cow Management, Neonatal Calf Development). Adam then received his Ph.D. from Virginia Tech in Lactation Physiology. His dissertation was a series of work dedicated to understanding the relationship between nutrition of the calf and the mammary gland and understanding how both interact with various hormonal axes to improve milk production. Adam then spent time with a large animal nutrition company in the US before starting with Zinpro as a Research Nutritionist in 2017. Adam has been an invited speaker and/or conducted technical service visits in over 45 states in the United States and 58 countries throughout the world. Adam focuses heavily on lameness, dairy cow nutrition, calf and heifer management, colostrum management, transition cow management, and mammary function/health. Now, Adam is a business development manager for Zinpro’s Colostrum Division and continues to provide technical service globally. Adam currently resides in Madison, Georgia (USA) with his wife, Abby, and their 2 kids, Abram (7 years) and Adelyn (5 years).

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Melissa Cantor

Author Melissa Cantor

Melissa Cantor is a postdoctoral fellow working with Dr. Renaud’s lab in the Department of Population Medicine at the University of Guelph. Her research interests include using precision technologies to improve dairy animal health, productivity and welfare. She completed her Ph.D. at the University of Kentucky and her M.Sc. at the University of Wisconsin-Madison. Prior to her current role, Melissa worked as a milk tester, where she gained firsthand experience working on dairy farms. You will enjoy learning from this passionate calf expert.

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Bethany Dado-Senn

Dr. Bethany Dado-Senn is a Calf and Heifer Technical Specialist with Vita Plus and the 2022 American Dairy Science Association (ADSA) recipient of the National Milk Producers Federation Richard M. Hoyt Award for graduate research efforts directly impacting the dairy industry. Bethany has extensive expertise in environmental and dairy herd management and a passion for communication and education.

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Alyssa Dietrich

Author Alyssa Dietrich

Alyssa Dietrich is a Calf and Heifer Specialist with Cargill serving the mid-Atlantic states in the US.  She graduated from Penn State University in 2013 with a B. S. degree in Animal Sciences and obtained an M.S. degree in Dairy Science at Virginia Tech. Her calf expertise with autofeeders was heightened during a joint study with Dr. Whitney Knauer on the management of automatic calf feeders.

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Dr. Tom Earleywine

Dr. Tom Earleywine is the Director of Nutritional Services at Land O Lakes Milk Products.  He is a calf care mastermind with a contagious passion for calves. He grew up on a dairy farm in south central Wisconsin, earned his bachelor’s, master’s and doctoral degrees in dairy science with a focus on dairy nutrition from the University of Wisconsin-Madison.

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Melissa Cantor

Author Melissa Cantor

Melissa Cantor is a postdoctoral fellow working with Dr. Renaud’s lab in the Department of Population Medicine at the University of Guelph. Her research interests include using precision technologies to improve dairy animal health, productivity and welfare. She completed her Ph.D. at the University of Kentucky and her M.Sc. at the University of Wisconsin-Madison. Prior to her current role, Melissa worked as a milk tester, where she gained firsthand experience working on dairy farms. You will enjoy learning from this passionate calf expert.

Read Her Posts:


Bethany Dado-Senn

Dr. Bethany Dado-Senn is a Calf and Heifer Technical Specialist with Vita Plus and the 2022 American Dairy Science Association (ADSA) recipient of the National Milk Producers Federation Richard M. Hoyt Award for graduate research efforts directly impacting the dairy industry. Bethany has extensive expertise in environmental and dairy herd management and a passion for communication and education.

 Read Her Post:


Alyssa Dietrich

Author Alyssa Dietrich

Alyssa Dietrich is a Calf and Heifer Specialist with Cargill serving the mid-Atlantic states in the US.  She graduated from Penn State University in 2013 with a B. S. degree in Animal Sciences and obtained an M.S. degree in Dairy Science at Virginia Tech. Her calf expertise with autofeeders was heightened during a joint study with Dr. Whitney Knauer on the management of automatic calf feeders.

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Dr. Tom Earleywine

Dr. Tom Earleywine is the Director of Nutritional Services at Land O Lakes Milk Products.  He is a calf care mastermind with a contagious passion for calves. He grew up on a dairy farm in south central Wisconsin, earned his bachelor’s, master’s and doctoral degrees in dairy science with a focus on dairy nutrition from the University of Wisconsin-Madison.

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Sue Puffenbarger

Sue is a Senior Territory Business manager for Zoetis on the East Coast of the US, from Maryland to North Georgia. She is responsible for sales and support of the extensive line of Zoetis cattle products. She routinely helps clients with herd health and management decisions on their farms and teams with veterinarians to create health protocols for their clients’ animals. Her passion is working with calves and heifers and her goal is to help farms maximize growth and the future production of those animals. 

Prior to this position, Sue was an account manager with Land O’Lakes Animal Milk Products. Sue has a bachelor’s degree in Animal Science and a Masters in Dairy Cattle Reproduction from Virginia Tech.